添加图表数据展示功能

- 后端新增/chart-data接口用于获取图表所需数据
- 实现近6个月出入库金额统计和药品分类占比功能
- 前端集成echarts图表组件展示数据可视化
- 添加月度出入库柱状图和药品分类饼图
- 优化仪表盘界面布局和样式

frontend/package-lock.json

@@ -10,9 +10,11 @@
       "dependencies": {
         "@element-plus/icons-vue": "^2.3.2",
         "axios": "^1.18.1",
+        "echarts": "^6.1.0",
         "element-plus": "^2.14.2",
         "pinia": "^2.3.1",
         "vue": "^3.5.39",
+        "vue-echarts": "^8.0.1",
         "vue-router": "^4.6.4"
       },
       "devDependencies": {
@@ -1097,6 +1099,22 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/echarts": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmmirror.com/echarts/-/echarts-6.1.0.tgz",
+      "integrity": "sha512-q0yaFPggC9FUdsWH4blavRWFmxdrIodbkoKNAjJudAI6CA9gNPxHtV2RcZNEepZVlk4yvBYkOkbk6HIVpIyHZA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "tslib": "2.3.0",
+        "zrender": "6.1.0"
+      }
+    },
+    "node_modules/echarts/node_modules/tslib": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmmirror.com/tslib/-/tslib-2.3.0.tgz",
+      "integrity": "sha512-N82ooyxVNm6h1riLCoyS9e3fuJ3AMG2zIZs2Gd1ATcSFjSA23Q0fzjjZeh0jbJvWVDZ0cJT8yaNNaaXHzueNjg==",
+      "license": "0BSD"
+    },
     "node_modules/element-plus": {
       "version": "2.14.2",
       "resolved": "https://registry.npmmirror.com/element-plus/-/element-plus-2.14.2.tgz",
@@ -2081,6 +2099,16 @@
         }
       }
     },
+    "node_modules/vue-echarts": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmmirror.com/vue-echarts/-/vue-echarts-8.0.1.tgz",
+      "integrity": "sha512-23rJTFLu1OUEGRWjJGmdGt8fP+8+ja1gVgzMYPIPaHWpXegcO1viIAaeu2H4QHESlVeHzUAHIxKXGrwjsyXAaA==",
+      "license": "MIT",
+      "peerDependencies": {
+        "echarts": "^6.0.0",
+        "vue": "^3.3.0"
+      }
+    },
     "node_modules/vue-router": {
       "version": "4.6.4",
       "resolved": "https://registry.npmmirror.com/vue-router/-/vue-router-4.6.4.tgz",
@@ -2095,6 +2123,21 @@
       "peerDependencies": {
         "vue": "^3.5.0"
       }
+    },
+    "node_modules/zrender": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmmirror.com/zrender/-/zrender-6.1.0.tgz",
+      "integrity": "sha512-oEGMDB6pOP2S6OwRR4PdVv610zrjnA3Bh+JnSG12fYJlBKjtNAoEb5fSUoCOOINlH96I2fU38/A2UpRKs67xYQ==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tslib": "2.3.0"
+      }
+    },
+    "node_modules/zrender/node_modules/tslib": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmmirror.com/tslib/-/tslib-2.3.0.tgz",
+      "integrity": "sha512-N82ooyxVNm6h1riLCoyS9e3fuJ3AMG2zIZs2Gd1ATcSFjSA23Q0fzjjZeh0jbJvWVDZ0cJT8yaNNaaXHzueNjg==",
+      "license": "0BSD"
     }
   }
 }