chore(workspace): bootstrap platform, judge and frontend

tests/README.md

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+# 跨工程测试材料
+
+`fixtures/contracts/` 保存 Python/Rust 共用的合法与非法协议样例。
+各工程自身的测试仍放在 `backend/tests/` 与 Rust crate 的 `tests/` 中。
+
+后续在这里增加构造题目、正常/异常程序及端到端夹具，不提交真实私有代码或隐藏题库。
+沙箱破坏性测试在明确的专用执行环境中进行，不由普通构建检查自动运行。

tests/fixtures/contracts/judge-task.invalid-extra.json

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+{
+  "schema_version": 1,
+  "kind": "judge.evaluation",
+  "evaluation_id": "018f26d6-713c-7b7f-8d5d-5f832a5f47f2",
+  "source_code": "not allowed in notification"
+}

tests/fixtures/contracts/judge-task.invalid-id.json

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+{
+  "schema_version": 1,
+  "kind": "judge.evaluation",
+  "evaluation_id": "not-a-uuid"
+}

tests/fixtures/contracts/judge-task.invalid-kind.json

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+{
+  "schema_version": 1,
+  "kind": "learning.run",
+  "evaluation_id": "018f26d6-713c-7b7f-8d5d-5f832a5f47f2"
+}

tests/fixtures/contracts/judge-task.invalid-version.json

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+{
+  "schema_version": 2,
+  "kind": "judge.evaluation",
+  "evaluation_id": "018f26d6-713c-7b7f-8d5d-5f832a5f47f2"
+}

tests/fixtures/contracts/judge-task.valid.json

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+{
+  "schema_version": 1,
+  "kind": "judge.evaluation",
+  "evaluation_id": "018f26d6-713c-7b7f-8d5d-5f832a5f47f2"
+}