feat(student-bff): 完整实现 student-bff 聚合层

包含 src 全部实现、Dockerfile、shared-ts/bff 包等

services/student-bff/vitest.config.ts

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+/**
+ * Vitest 配置 - student-bff 单元测试.
+ *
+ * 仲裁依据:
+ *   - workline §3.2 P3.9 (单元测试覆盖率≥80%)
+ *   - project_rules §3.1 (零错误通过)
+ *
+ * 覆盖范围:
+ *   - Resolver: auth/dashboard/homework/grades/exams/classes/content/analytics/notifications/ai
+ *   - Guard: authorization.guard
+ *   - DataLoader: data-loader.module
+ *   - Shared: action-state, cache, application-error, global-error.filter
+ */
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "node",
+    include: ["src/**/*.test.ts"],
+    coverage: {
+      provider: "v8",
+      reporter: ["text", "json", "html"],
+      include: [
+        "src/student/resolvers/**/*.ts",
+        "src/student/guards/**/*.ts",
+        "src/student/dataloaders/**/*.ts",
+        "src/shared/**/*.ts",
+      ],
+      exclude: [
+        "src/**/*.module.ts",
+        "src/**/*.test.ts",
+        "src/main.ts",
+        "src/config/mock-data.ts",
+      ],
+      thresholds: {
+        lines: 80,
+        functions: 80,
+        branches: 70,
+        statements: 80,
+      },
+    },
+  },
+});