feat: initialize app with routing, query management, and UI framework

- Replace Vite boilerplate with React Router for page navigation
- Add React Query for server state and cache management
- Integrate shadcn/ui component library with Tailwind CSS v4
- Configure @/ path alias for clean module imports
- Set up Vite dev proxy to API backend
- Remove default App.css, App.tsx, and react.svg assets

src/types/api.ts

@@ -0,0 +1,82 @@
+// ---- Generic API result wrapper ----
+export interface ApiResult<T> {
+  code: number
+  message: string
+  data: T | null
+}
+
+// ---- Auth ----
+export interface UserLoginDto {
+  username: string
+  password: string
+}
+
+export interface LoginVo {
+  token: string
+  username: string
+  role: string
+}
+
+export type ApiResultLoginVo = ApiResult<LoginVo>
+
+// ---- Book ----
+export interface Book {
+  id: number | null
+  name: string
+  author: string
+  stock: number
+}
+
+export type ApiResultBook = ApiResult<Book>
+export type ApiResultListBook = ApiResult<Book[]>
+
+export interface BookAddDto {
+  name: string
+  author: string
+  stock: number
+}
+
+export interface BookUpdateDto {
+  name: string
+  author: string
+}
+
+// ---- Borrow / MyBorrow ----
+export interface BookBorrowVo {
+  id: number
+  name: string
+  author: string
+}
+
+export interface MyBorrowVo {
+  id: number
+  bookBorrowVo: BookBorrowVo
+  borrowTime: string
+  returnTime: string | null
+  status: string
+}
+
+export type ApiResultMyBorrowVo = ApiResult<MyBorrowVo>
+export type ApiResultListMyBorrowVo = ApiResult<MyBorrowVo[]>
+
+// ---- Admin Borrow ----
+export interface UserBorrowVo {
+  id: number
+  username: string
+  role: string
+}
+
+export interface BorrowInfoVo {
+  id: number
+  bookBorrowVo: BookBorrowVo
+  userBorrowVo: UserBorrowVo
+  borrowTime: string
+  returnTime: string | null
+  status: string
+}
+
+export type ApiResultBorrowInfoVo = ApiResult<BorrowInfoVo>
+export type ApiResultListBorrowInfoVo = ApiResult<BorrowInfoVo[]>
+
+// ---- Utils ----
+export type ApiResultString = ApiResult<string | null>