refactor: 统一路由模块命名规范并更新导入路径

- 更新导入路径，将 router 从 './router' 改为 './routers'。
- 删除API路由配置，移除对todo处理函数的引用及服务器路由实例的定义。
- 添加路由配置，集成待办事项模块到主路由中。
- 重命名文件以统一项目中路由模块的命名规范
- 将导入路径从 '@/api/router' 更新为 '@/api/routers' 以正确引用路由配置。

apps/server/src/api/client.ts

@@ -4,7 +4,7 @@ import { createRouterClient } from '@orpc/server'
 import { createTanstackQueryUtils } from '@orpc/tanstack-query'
 import { createIsomorphicFn } from '@tanstack/react-start'
 import { getRequestHeaders } from '@tanstack/react-start/server'
-import { router } from './router'
+import { router } from './routers'
 import type { RouterClient } from './types'
 
 const getORPCClient = createIsomorphicFn()

apps/server/src/api/router.ts

@@ -1,6 +0,0 @@
-import * as todo from './handlers/todo'
-import { os } from './server'
-
-export const router = os.router({
-  todo,
-})

apps/server/src/api/routers/index.ts

@@ -0,0 +1,6 @@
+import { os } from '../server'
+import * as todo from './todo'
+
+export const router = os.router({
+  todo,
+})

apps/server/src/routes/api/rpc.$.ts

@@ -2,7 +2,7 @@ import { ORPCError, onError, ValidationError } from '@orpc/server'
 import { RPCHandler } from '@orpc/server/fetch'
 import { createFileRoute } from '@tanstack/react-router'
 import { z } from 'zod'
-import { router } from '@/api/router'
+import { router } from '@/api/routers'
 
 const handler = new RPCHandler(router, {
   interceptors: [