feat(server): 重构路由模块，优化开发体验

- 提取路由配置到独立的 router 包
- 优化 Makefile 并行启动前后端开发服务器
- 修复 Swagger 文档生成命令

Makefile

@@ -27,16 +27,13 @@ build-server:
 	@echo "Building server..."
 	cd server && go build -o bin/xinfra ./cmd/server
 
-# 启动开发服务器
-run: run-frontend run-server
-
-run-frontend:
-	@echo "Starting frontend dev server..."
-	cd frontend && npm run dev
-
-run-server:
-	@echo "Starting server..."
-	cd server && go run ./cmd/server
+# 启动开发服务器（前后端并行）
+run:
+	@echo "Starting development servers..."
+	@trap 'kill 0' EXIT; \
+	cd frontend && npm run dev & \
+	cd server && go run ./cmd/server & \
+	wait
 
 # 运行测试
 test: test-frontend test-server
@@ -79,7 +76,7 @@ dev-down:
 # Swagger 文档
 swagger:
 	@echo "Generating Swagger documentation..."
-	cd server && swag init -g cmd/server/main.go -o ./docs
+	cd server && swag init -g internal/router/router.go -o ./docs
 	@echo "Swagger docs generated at server/docs/"
 
 # 数据库迁移