feat(inbox): 素材持久化 CRUD — 数据库表 + API + 前端接入

- 新增 materials 表（id/projectId/description/associatedDate/status/createdAt/updatedAt）
- 新增 4 个后端 API 路由（list/create/get/delete）+ 13 个测试
- 新增 use-materials hooks（TanStack Query）
- 收集箱页面重构为三层架构（InboxPage + MaterialSidebar + MaterialDetailPanel）
- MaterialCard: Popconfirm 删除确认 + 粗粒度时间格式
- MaterialContent: 展示状态标签 + createdAt
- 更新开发文档 backend.md / frontend.md

src/server/server.ts

@@ -220,6 +220,42 @@ export function startServer(options: StartServerOptions) {
           logger,
         ),
       },
+      "/api/projects/:id/materials": {
+        GET: withErrorHandler(
+          async (req) => {
+            const { handleListMaterials } = await import("./routes/materials/list");
+            return handleListMaterials(req, db, mode, logger);
+          },
+          mode,
+          logger,
+        ),
+        POST: withErrorHandler(
+          async (req) => {
+            const { handleCreateMaterial } = await import("./routes/materials/create");
+            return handleCreateMaterial(req, db, mode, logger);
+          },
+          mode,
+          logger,
+        ),
+      },
+      "/api/projects/:id/materials/:mid": {
+        DELETE: withErrorHandler(
+          async (req) => {
+            const { handleDeleteMaterial } = await import("./routes/materials/delete");
+            return handleDeleteMaterial(req, db, mode, logger);
+          },
+          mode,
+          logger,
+        ),
+        GET: withErrorHandler(
+          async (req) => {
+            const { handleGetMaterial } = await import("./routes/materials/get");
+            return handleGetMaterial(req, db, mode, logger);
+          },
+          mode,
+          logger,
+        ),
+      },
       "/api/projects/:id/restore": {
         POST: withErrorHandler(
           async (req) => {