feat(frontend): add account and community page previews

Add profiles, discussions, team creation, authentication forms and the about page.
Validate preview forms and display the available platform health endpoint.

frontend/src/router/index.ts

@@ -54,6 +54,39 @@ export const router = createRouter({
       meta: { title: '排名' },
       component: () => import('../views/RankingsView.vue'),
     },
+    {
+      path: '/discussions',
+      meta: { title: '讨论' },
+      component: () => import('../views/DiscussionsView.vue'),
+    },
+    {
+      path: '/discussions/:id',
+      meta: { title: '讨论详情' },
+      component: () => import('../views/DiscussionDetailView.vue'),
+    },
+    { path: '/teams', meta: { title: '团队' }, component: () => import('../views/TeamsView.vue') },
+    {
+      path: '/teams/create',
+      meta: { title: '创建团队' },
+      component: () => import('../views/CreateTeamView.vue'),
+    },
+    {
+      path: '/users/:username',
+      meta: { title: '个人主页' },
+      component: () => import('../views/ProfileView.vue'),
+    },
+    { path: '/login', meta: { title: '登录' }, component: () => import('../views/AuthView.vue') },
+    {
+      path: '/register',
+      meta: { title: '注册' },
+      component: () => import('../views/AuthView.vue'),
+    },
+    {
+      path: '/logout',
+      meta: { title: '退出登录' },
+      component: () => import('../views/LogoutView.vue'),
+    },
+    { path: '/about', meta: { title: '关于' }, component: () => import('../views/AboutView.vue') },
     {
       path: '/:pathMatch(.*)*',
       name: 'not-found',

frontend/src/views/AboutView.vue

@@ -0,0 +1,81 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import { usePlatformHealth } from '../composables/usePlatformHealth'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+import UiIcon from '../components/UiIcon.vue'
+const { state, version, refresh } = usePlatformHealth()
+const status = computed(
+  () =>
+    ({ loading: '正在检查', connected: 'API 进程已连接', unavailable: 'API 暂未连接' })[
+      state.value
+    ],
+)
+const features = [
+  { icon: 'problems', title: '练习与训练', text: '从基础题目到算法专题，通过题单组织日常练习。' },
+  { icon: 'contests', title: '竞赛与评测', text: '围绕提交、评测和比赛，逐步完成在线评测流程。' },
+  {
+    icon: 'discussions',
+    title: '交流与成长',
+    text: '分享解题思路，结合练习记录，探索更合适的学习路径。',
+  },
+]
+</script>
+<template>
+  <PageHeading
+    title="关于 KF OnlineJudge"
+    eyebrow="ABOUT"
+    description="从一道题开始，积累每一次进步。"
+  />
+  <div class="intro-banner">
+    <div>
+      <p class="eyebrow">CODE · PRACTICE · GROW</p>
+      <h2>让思路在代码里落地。</h2>
+      <p>
+        KF OnlineJudge
+        是一个正在开发的在线评测项目，关注判题、沙箱、分布式执行与故障恢复，并逐步提供辅助答疑和个性化训练。
+      </p>
+    </div>
+    <span class="intro-number">KF.</span>
+  </div>
+  <div class="stack">
+    <PanelCard title="在这里，你可以" icon="reading"
+      ><div class="about-grid">
+        <div v-for="feature in features" :key="feature.title" class="about-feature">
+          <UiIcon :name="feature.icon" />
+          <h3>{{ feature.title }}</h3>
+          <p>{{ feature.text }}</p>
+        </div>
+      </div></PanelCard
+    ><PanelCard id="system" title="系统状态" icon="monitor"
+      ><div class="service-row">
+        <div>
+          <h3>
+            平台 API
+            <el-tag
+              :type="state === 'connected' ? 'success' : 'info'"
+              size="small"
+              effect="plain"
+              >{{ status }}</el-tag
+            >
+          </h3>
+          <p>
+            这是实际的 API 存活检查。{{ version && state === 'connected' ? '版本 ' + version : '' }}
+          </p>
+          <p>数据库、题库、评测与学习服务将分别接入。</p>
+        </div>
+        <el-button :loading="state === 'loading'" @click="refresh">重新检查</el-button>
+      </div></PanelCard
+    ><PanelCard title="使用说明" icon="about"
+      ><div class="detail-prose">
+        <p>
+          当前为前端预览版本。题目、比赛、排名和用户信息使用示例数据；页面筛选、导航和本地代码草稿已可使用。
+        </p>
+        <p style="margin-top: 12px">
+          题目页可以选择语言、切换编辑器主题、保存草稿和填写自测输入。实际评测、账号和团队创建将在服务接入后开放。
+        </p>
+        <p style="margin-top: 12px">备案信息待填写，平台规则和联系方式将在上线前补充。</p>
+      </div></PanelCard
+    >
+  </div>
+</template>

frontend/src/views/AuthView.vue

@@ -0,0 +1,100 @@
+<script setup lang="ts">
+import { computed, reactive, ref } from 'vue'
+import { useRoute } from 'vue-router'
+import { ElMessage, type FormInstance, type FormRules } from 'element-plus'
+const route = useRoute()
+const registering = computed(() => route.path === '/register')
+const form = ref<FormInstance>()
+const model = reactive({ username: '', email: '', password: '', confirmation: '' })
+const rules = computed<FormRules<typeof model>>(() => ({
+  username: [
+    { required: true, message: '请输入用户名', trigger: 'blur' },
+    ...(registering.value
+      ? [
+          {
+            pattern: /^[a-zA-Z0-9_]{3,24}$/,
+            message: '使用 3 至 24 位字母、数字或下划线',
+            trigger: 'blur',
+          },
+        ]
+      : []),
+  ],
+  email: [
+    { required: true, message: '请输入邮箱', trigger: 'blur' },
+    { type: 'email', message: '请填写有效邮箱', trigger: 'blur' },
+  ],
+  password: [
+    { required: true, message: '请输入密码', trigger: 'blur' },
+    ...(registering.value ? [{ min: 8, message: '密码至少包含 8 个字符', trigger: 'blur' }] : []),
+  ],
+  confirmation: [
+    { required: true, message: '请再次输入密码', trigger: 'blur' },
+    {
+      validator: (_rule, value, callback) =>
+        value === model.password ? callback() : callback(new Error('两次输入的密码不一致')),
+      trigger: 'blur',
+    },
+  ],
+}))
+async function submit() {
+  if (await form.value?.validate().catch(() => false))
+    ElMessage.info('账号服务尚未接入，暂时无法' + (registering.value ? '注册' : '登录'))
+}
+</script>
+<template>
+  <div class="auth-shell">
+    <aside class="auth-art">
+      <RouterLink to="/" class="brand"
+        ><span class="brand-mark">KF.</span><span class="brand-name">OnlineJudge</span></RouterLink
+      >
+      <h1>写下思路，<br />开始这一题。</h1>
+      <p>练习、竞赛、讨论。<br />每一步，都算数。</p>
+    </aside>
+    <section class="auth-form">
+      <p class="eyebrow">WELCOME TO KF ONLINEJUDGE</p>
+      <h2>{{ registering ? '创建你的账号' : '欢迎回来' }}</h2>
+      <p>{{ registering ? '准备好开始新的练习了吗？' : '继续你的算法练习之旅。' }}</p>
+      <el-form
+        ref="form"
+        :model="model"
+        :rules="rules"
+        label-position="top"
+        @submit.prevent="submit"
+        ><el-form-item label="用户名" prop="username"
+          ><el-input
+            v-model="model.username"
+            placeholder="请输入用户名"
+            autocomplete="username" /></el-form-item
+        ><el-form-item v-if="registering" label="邮箱" prop="email"
+          ><el-input
+            v-model="model.email"
+            placeholder="your@email.com"
+            autocomplete="email" /></el-form-item
+        ><el-form-item label="密码" prop="password"
+          ><el-input
+            v-model="model.password"
+            type="password"
+            show-password
+            placeholder="请输入密码"
+            :autocomplete="registering ? 'new-password' : 'current-password'" /></el-form-item
+        ><el-form-item v-if="registering" label="确认密码" prop="confirmation"
+          ><el-input
+            v-model="model.confirmation"
+            type="password"
+            show-password
+            placeholder="再次输入密码"
+            autocomplete="new-password" /></el-form-item
+        ><el-button type="primary" native-type="submit">{{
+          registering ? '注册' : '登录'
+        }}</el-button></el-form
+      >
+      <p class="form-help" style="margin-top: 14px">账号功能待接入，当前不会创建账号或保存密码。</p>
+      <div class="auth-links">
+        <RouterLink to="/">← 返回首页</RouterLink
+        ><RouterLink :to="registering ? '/login' : '/register'">{{
+          registering ? '已有账号？去登录' : '还没有账号？去注册'
+        }}</RouterLink>
+      </div>
+    </section>
+  </div>
+</template>

frontend/src/views/CreateTeamView.vue

@@ -0,0 +1,69 @@
+<script setup lang="ts">
+import { reactive, ref } from 'vue'
+import { ElMessage, type FormInstance, type FormRules } from 'element-plus'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+const form = ref<FormInstance>()
+const model = reactive({ name: '', description: '', visibility: 'public', joinMode: 'approval' })
+const rules: FormRules<typeof model> = {
+  name: [
+    { required: true, message: '请填写团队名称', trigger: 'blur' },
+    { min: 2, max: 30, message: '名称长度为 2 到 30 个字符', trigger: 'blur' },
+  ],
+  description: [
+    { required: true, message: '请填写团队介绍', trigger: 'blur' },
+    { max: 500, message: '介绍最多 500 个字符', trigger: 'blur' },
+  ],
+}
+async function validate() {
+  if (await form.value?.validate().catch(() => false))
+    ElMessage.info('填写已通过检查，团队创建功能待服务接入')
+}
+</script>
+<template>
+  <PageHeading
+    title="创建团队"
+    eyebrow="CREATE A TEAM"
+    description="为团队起一个名字，写下你们想一起完成的事情。"
+    ><RouterLink to="/teams"><el-button>返回团队列表</el-button></RouterLink></PageHeading
+  ><PanelCard title="团队资料" icon="teams" class="form-panel"
+    ><el-form
+      ref="form"
+      :model="model"
+      :rules="rules"
+      label-position="top"
+      @submit.prevent="validate"
+      ><el-form-item label="团队名称" prop="name"
+        ><el-input
+          v-model="model.name"
+          placeholder="例如：KF 算法研习组"
+          maxlength="30"
+          show-word-limit /></el-form-item
+      ><el-form-item label="团队介绍" prop="description"
+        ><el-input
+          v-model="model.description"
+          type="textarea"
+          :rows="5"
+          placeholder="介绍团队的练习方向、交流方式和目标"
+          maxlength="500"
+          show-word-limit /></el-form-item
+      ><el-form-item label="可见性"
+        ><el-radio-group v-model="model.visibility"
+          ><el-radio value="public">公开团队</el-radio
+          ><el-radio value="private">私有团队</el-radio></el-radio-group
+        >
+        <p class="form-help">公开团队可在团队列表中发现，私有团队通过邀请加入。</p></el-form-item
+      ><el-form-item label="加入方式"
+        ><el-radio-group v-model="model.joinMode"
+          ><el-radio value="approval">需要审核</el-radio
+          ><el-radio value="invite">仅接受邀请</el-radio></el-radio-group
+        ></el-form-item
+      >
+      <div class="form-actions">
+        <el-button native-type="submit">检查填写</el-button
+        ><el-button type="primary" disabled>创建团队</el-button
+        ><span class="muted">团队服务待接入</span>
+      </div></el-form
+    ></PanelCard
+  >
+</template>

frontend/src/views/DiscussionDetailView.vue

@@ -0,0 +1,40 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import { useRoute } from 'vue-router'
+import { discussions } from '../data/preview'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+import EmptyState from '../components/EmptyState.vue'
+const route = useRoute()
+const discussion = computed(() => discussions.find((d) => d.id === route.params.id))
+</script>
+<template>
+  <template v-if="discussion"
+    ><div class="breadcrumbs">
+      <RouterLink to="/discussions">讨论</RouterLink><span>/</span
+      ><span>{{ discussion.category }}</span>
+    </div>
+    <PageHeading :title="discussion.title"
+      ><el-tag effect="plain">{{ discussion.category }}</el-tag></PageHeading
+    ><PanelCard title="正文" icon="reading" subtitle="示例文章"
+      ><div class="detail-meta">
+        <RouterLink :to="'/users/' + discussion.author">{{ discussion.author }}</RouterLink
+        ><time>{{ discussion.date }}</time
+        ><span>{{ discussion.views }} 次浏览</span>
+      </div>
+      <div class="detail-prose">
+        <p>{{ discussion.content }}</p>
+      </div>
+      <RouterLink
+        v-if="discussion.problemId"
+        class="text-link"
+        :to="'/problems/' + discussion.problemId"
+        style="display: inline-block; margin-top: 24px"
+        >查看相关题目 →</RouterLink
+      >
+      <div class="comment-placeholder">评论功能将在社区服务接入后开放。</div></PanelCard
+    ></template
+  ><EmptyState v-else title="讨论不存在"
+    ><RouterLink to="/discussions"><el-button>返回讨论列表</el-button></RouterLink></EmptyState
+  >
+</template>

frontend/src/views/DiscussionsView.vue

@@ -0,0 +1,77 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { discussions, rankings } from '../data/preview'
+import PageHeading from '../components/PageHeading.vue'
+import PanelCard from '../components/PanelCard.vue'
+const category = ref('全部')
+const query = ref('')
+const items = computed(() =>
+  discussions.filter(
+    (d) =>
+      (category.value === '全部' || d.category === category.value) && d.title.includes(query.value),
+  ),
+)
+</script>
+<template>
+  <PageHeading
+    title="讨论社区"
+    eyebrow="COMMUNITY"
+    description="分享思路，提出问题，一起把代码写得更好。"
+    ><el-tooltip content="讨论发布将在账号服务接入后开放"
+      ><el-button type="primary" disabled>发起讨论</el-button></el-tooltip
+    ></PageHeading
+  >
+  <div class="content-with-aside">
+    <PanelCard title="最新讨论" icon="discussions" subtitle="示例文章"
+      ><div class="filters">
+        <el-radio-group v-model="category"
+          ><el-radio-button
+            v-for="c in ['全部', '交流', '问答', '题解', '反馈']"
+            :key="c"
+            :value="c"
+            >{{ c }}</el-radio-button
+          ></el-radio-group
+        ><el-input v-model="query" placeholder="搜索讨论" aria-label="搜索讨论" clearable />
+      </div>
+      <article v-for="discussion in items" :key="discussion.id" class="discussion-item">
+        <RouterLink
+          :to="'/users/' + discussion.author"
+          class="avatar"
+          :style="{ background: rankings.find((r) => r.username === discussion.author)?.color }"
+          >{{ discussion.author[0] }}</RouterLink
+        >
+        <div>
+          <h2>
+            <el-tag v-if="discussion.pinned" size="small" effect="plain">置顶</el-tag
+            ><RouterLink :to="'/discussions/' + discussion.id">{{ discussion.title }}</RouterLink>
+          </h2>
+          <p>
+            <span class="tag">{{ discussion.category }}</span
+            ><RouterLink :to="'/users/' + discussion.author">{{ discussion.author }}</RouterLink
+            ><span>{{ discussion.date }}</span>
+          </p>
+        </div>
+        <div class="discussion-numbers">
+          <span
+            ><strong>{{ discussion.replies }}</strong> 回复</span
+          ><span>{{ discussion.views }} 浏览</span>
+        </div>
+      </article>
+      <el-empty v-if="!items.length" description="没有符合条件的讨论"
+    /></PanelCard>
+    <div class="stack">
+      <PanelCard title="欢迎交流" icon="reading"
+        ><p class="small muted">
+          提问时写清楚题号、语言、报错和已经尝试过的思路。分享题解时，也可以记录从哪里开始卡住，以及后来怎样找到解法。
+        </p></PanelCard
+      ><PanelCard title="社区分区" icon="folder"
+        ><dl class="details-list">
+          <div v-for="c in ['交流', '问答', '题解', '反馈']" :key="c">
+            <dt>{{ c }}</dt>
+            <dd>{{ discussions.filter((d) => d.category === c).length }} 篇示例文章</dd>
+          </div>
+        </dl></PanelCard
+      >
+    </div>
+  </div>
+</template>

frontend/src/views/LogoutView.vue

@@ -0,0 +1,13 @@
+<script setup lang="ts">
+import EmptyState from '../components/EmptyState.vue'
+</script>
+<template>
+  <div class="panel" style="max-width: 650px; margin: 50px auto">
+    <EmptyState title="当前没有登录会话" description="账号服务接入后，这里会清除会话并退出登录。"
+      ><RouterLink to="/"><el-button type="primary">返回首页</el-button></RouterLink
+      ><RouterLink to="/login" style="margin-left: 12px"
+        ><el-button>去登录</el-button></RouterLink
+      ></EmptyState
+    >
+  </div>
+</template>

frontend/src/views/ProfileView.vue

@@ -0,0 +1,105 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { useRoute } from 'vue-router'
+import { rankings, submissions, problems } from '../data/preview'
+import PanelCard from '../components/PanelCard.vue'
+import SubmissionTable from '../components/SubmissionTable.vue'
+import ProblemTable from '../components/ProblemTable.vue'
+import EmptyState from '../components/EmptyState.vue'
+const route = useRoute()
+const user = computed(() => rankings.find((u) => u.username === route.params.username))
+const tab = ref('activity')
+const records = computed(() => submissions.filter((s) => s.username === user.value?.username))
+const solved = computed(() =>
+  problems.filter((p) => records.value.some((s) => s.problemId === p.id && s.verdict === 'AC')),
+)
+const activity = Array.from({ length: 140 }, (_, index) =>
+  index % 11 === 0 ? 4 : index % 7 === 0 ? 3 : index % 3 === 0 ? 2 : index % 2 === 0 ? 1 : 0,
+)
+</script>
+<template>
+  <template v-if="user"
+    ><div class="profile-banner">
+      <span class="avatar" :style="{ background: user.color }">{{ user.username[0] }}</span>
+      <div>
+        <p class="eyebrow">PERSONAL PROFILE · 示例用户</p>
+        <h1>{{ user.username }}</h1>
+        <p>{{ user.motto }}</p>
+        <div class="profile-tags">
+          <span class="tag">算法爱好者</span><span class="tag">持续练习</span>
+        </div>
+      </div>
+      <div class="profile-actions">
+        <RouterLink :to="{ path: '/submissions', query: { user: user.username } }"
+          ><el-button>查看提交</el-button></RouterLink
+        ><el-button disabled>关注</el-button>
+      </div>
+    </div>
+    <div class="summary-grid">
+      <div class="summary-card">
+        <p>已通过题目</p>
+        <strong>{{ user.solved }}</strong
+        ><small>示例统计</small>
+      </div>
+      <div class="summary-card">
+        <p>总提交数</p>
+        <strong>{{ user.submissions }}</strong
+        ><small>示例统计</small>
+      </div>
+      <div class="summary-card">
+        <p>通过率</p>
+        <strong>{{ Math.round((user.solved / user.submissions) * 100) }}%</strong
+        ><small>示例统计</small>
+      </div>
+      <div class="summary-card">
+        <p>竞赛积分</p>
+        <strong>{{ user.rating }}</strong
+        ><small>示例积分</small>
+      </div>
+    </div>
+    <div class="content-with-aside">
+      <PanelCard title="练习记录" icon="rankings"
+        ><el-tabs v-model="tab"
+          ><el-tab-pane label="提交活动" name="activity"
+            ><p class="small muted">提交活动热力图 · 布局示例</p>
+            <div class="heatmap" role="img" aria-label="示例提交活动热力图">
+              <span
+                v-for="(level, index) in activity"
+                :key="index"
+                class="heat-cell"
+                :data-level="level"
+              />
+            </div>
+            <div class="detail-meta"><span>少</span><span>← 提交活跃度 →</span><span>多</span></div>
+            <SubmissionTable :items="records" compact /></el-tab-pane
+          ><el-tab-pane label="已通过题目" name="problems"
+            ><p class="tab-summary">以下题目来自当前示例提交记录。</p>
+            <ProblemTable :items="solved" compact /></el-tab-pane></el-tabs
+      ></PanelCard>
+      <div class="stack">
+        <PanelCard title="个人介绍" icon="about"
+          ><p class="small muted">{{ user.motto }}</p>
+          <dl class="details-list" style="margin-top: 20px">
+            <div>
+              <dt>用户名</dt>
+              <dd>{{ user.username }}</dd>
+            </div>
+            <div>
+              <dt>榜单位置</dt>
+              <dd>#{{ rankings.indexOf(user) + 1 }}</dd>
+            </div>
+          </dl></PanelCard
+        ><PanelCard title="学习分析" icon="reading"
+          ><p class="small muted">
+            后续结合历史代码、提交结果和题目标签，分析练习情况并生成个性化训练建议。
+          </p>
+          <el-button disabled style="margin-top: 18px; width: 100%"
+            >分析服务待接入</el-button
+          ></PanelCard
+        >
+      </div>
+    </div></template
+  ><EmptyState v-else title="用户不存在"
+    ><RouterLink to="/rankings"><el-button>查看排行榜</el-button></RouterLink></EmptyState
+  >
+</template>

frontend/src/views/TeamsView.vue

@@ -0,0 +1,61 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import PageHeading from '../components/PageHeading.vue'
+const query = ref('')
+const teams = [
+  {
+    name: 'KF 算法研习组',
+    initials: 'KF',
+    description: '一起练习基础算法，分享解题笔记。',
+    members: 12,
+    tags: ['基础训练', '算法交流'],
+  },
+  {
+    name: 'Rust 解题小队',
+    initials: 'RS',
+    description: '用 Rust 完成题目，交流语言与算法的使用经验。',
+    members: 8,
+    tags: ['Rust', '专题练习'],
+  },
+  {
+    name: '周末练习伙伴',
+    initials: 'AC',
+    description: '每周留一点时间，认真做几道题。',
+    members: 16,
+    tags: ['练习赛', '学习打卡'],
+  },
+]
+const items = computed(() =>
+  teams.filter((t) => t.name.toLowerCase().includes(query.value.toLowerCase())),
+)
+</script>
+<template>
+  <PageHeading title="团队" eyebrow="TEAMS" description="找到一起练习和交流的伙伴。"
+    ><RouterLink to="/teams/create"
+      ><el-button type="primary">创建团队</el-button></RouterLink
+    ></PageHeading
+  >
+  <div class="filters">
+    <el-input v-model="query" placeholder="搜索团队" aria-label="搜索团队" clearable /><span
+      class="filter-label"
+      >示例团队 · 加入功能待接入</span
+    >
+  </div>
+  <div class="card-grid">
+    <article v-for="team in items" :key="team.name" class="panel team-card">
+      <span class="team-logo">{{ team.initials }}</span>
+      <div style="flex: 1">
+        <h2>{{ team.name }}</h2>
+        <p>{{ team.description }}</p>
+        <div class="tag-list">
+          <span v-for="tag in team.tags" :key="tag" class="tag">{{ tag }}</span>
+        </div>
+        <div class="card-meta" style="margin-top: 20px">
+          <span>{{ team.members }} 名成员 · 示例</span
+          ><el-button disabled size="small" style="margin-left: auto">申请加入</el-button>
+        </div>
+      </div>
+    </article>
+  </div>
+  <el-empty v-if="!items.length" description="没有找到团队" />
+</template>