feat: Day 8-9 - Project Management API completed

Backend:
- Create project routes (GET, POST, PUT, DELETE)
- Implement projectController with CRUD operations
- Create projectService for database operations
- Add validation middleware for request validation
- Update Prisma schema (add background, researchType, deletedAt fields)
- Implement soft delete for projects

Frontend:
- Create projectApi service module
- Update useProjectStore with fetchProjects and loading state
- Connect ProjectSelector to real API with loading indicator
- Connect CreateProjectDialog to real API with error handling
- Connect EditProjectDialog to real API with loading state
- Add comprehensive error handling and user feedback

Build: Both frontend and backend build successfully

backend/src/routes/projects.ts

@@ -0,0 +1,53 @@
+import { FastifyInstance, FastifyRequest, FastifyReply } from 'fastify';
+import { projectController } from '../controllers/projectController.js';
+import { validateProjectCreate, validateProjectUpdate } from '../middleware/validateProject.js';
+
+interface ProjectParams {
+  id: string;
+}
+
+export async function projectRoutes(fastify: FastifyInstance) {
+  // 获取项目列表
+  fastify.get('/projects', async (request: FastifyRequest, reply: FastifyReply) => {
+    return projectController.getProjects(request, reply);
+  });
+
+  // 获取单个项目详情
+  fastify.get<{ Params: ProjectParams }>(
+    '/projects/:id',
+    async (request: FastifyRequest<{ Params: ProjectParams }>, reply: FastifyReply) => {
+      return projectController.getProjectById(request, reply);
+    }
+  );
+
+  // 创建项目
+  fastify.post(
+    '/projects',
+    {
+      preHandler: validateProjectCreate,
+    },
+    async (request: FastifyRequest, reply: FastifyReply) => {
+      return projectController.createProject(request, reply);
+    }
+  );
+
+  // 更新项目
+  fastify.put<{ Params: ProjectParams }>(
+    '/projects/:id',
+    {
+      preHandler: validateProjectUpdate,
+    },
+    async (request: FastifyRequest<{ Params: ProjectParams }>, reply: FastifyReply) => {
+      return projectController.updateProject(request, reply);
+    }
+  );
+
+  // 删除项目
+  fastify.delete<{ Params: ProjectParams }>(
+    '/projects/:id',
+    async (request: FastifyRequest<{ Params: ProjectParams }>, reply: FastifyReply) => {
+      return projectController.deleteProject(request, reply);
+    }
+  );
+}
+