refactor: 抽取 UI 组件、改进错误页面、统一导入路径并简化数据库接口

src/server/api/routers/todo.router.ts

@@ -1,8 +1,8 @@
 import { ORPCError } from '@orpc/server'
 import { eq } from 'drizzle-orm'
+import { db } from '@/server/api/middlewares'
+import { os } from '@/server/api/server'
 import { todoTable } from '@/server/db/schema'
-import { db } from '../middlewares'
-import { os } from '../server'
 
 export const list = os.todo.list.use(db).handler(async ({ context }) => {
   const todos = await context.db.query.todoTable.findMany({