feat(service): add service implementations for borrow and book queries

- Add AdminBorrowServiceImpl with search and getAllBorrows stubs
- Add BorrowServiceImpl with borrow record query stubs
- Add getAllBooks and getAllBorrows to service interfaces
- Mark dashboard components for future service decomposition

src/main/kotlin/com/msksbr/bookmgr/controller/AdminBorrowController.kt

@@ -7,6 +7,7 @@ import org.springframework.web.bind.annotation.RestController
 * 路径前缀（待定）：/api/admin/borrows
 *
 * 计划接口：
+*   - 全量获取借阅记录
 *   - 全量搜索借阅记录
 */
 @RestController

src/main/kotlin/com/msksbr/bookmgr/controller/DashBoardController.kt

@@ -19,6 +19,8 @@ import org.springframework.web.bind.annotation.RestController
 *   getAllBooks        — 无注解，游客 / 用户 / admin 均可
 *   getAllBorrowRecords — @RequireRole("admin")，仅管理员
 */
+
+// @TODO：拆分到各自的服务中
 @RestController
 @RequestMapping("/api/dashboard")
 class DashBoardController(

src/main/kotlin/com/msksbr/bookmgr/service/AdminBorrowService.kt

@@ -2,4 +2,5 @@ package com.msksbr.bookmgr.service
 
 interface AdminBorrowService {
     fun searchBorrows(query: String): Result<Any?>
+    fun getAllBorrows(): Result<Any?>
 }

src/main/kotlin/com/msksbr/bookmgr/service/BookService.kt

@@ -13,10 +13,12 @@ interface BookService {
     * @return 搜索结果列表，无匹配时返回 404
     */
     fun searchBook(query: String): Result<Any?>
+
     /*
     * 根据 ID 查询单本图书
     * @param id 图书 ID，必须为正整数
     * @return 图书实体，不存在时返回 404
     */
     fun getOneBook(id: Long): Result<Any?>
+    fun getAllBooks(): Result<Any?>
 }

src/main/kotlin/com/msksbr/bookmgr/service/impl/AdminBorrowServiceImpl.kt

@@ -0,0 +1,15 @@
+package com.msksbr.bookmgr.service.impl
+
+import com.msksbr.bookmgr.service.AdminBorrowService
+import org.springframework.stereotype.Service
+
+@Service
+class AdminBorrowServiceImpl : AdminBorrowService {
+    override fun searchBorrows(query: String): Result<Any?> {
+        TODO("Not yet implemented")
+    }
+
+    override fun getAllBorrows(): Result<Any?> {
+        TODO("Not yet implemented")
+    }
+}

src/main/kotlin/com/msksbr/bookmgr/service/impl/BookServiceImpl.kt

@@ -49,4 +49,8 @@ class BookServiceImpl(private val bookMapper: BookMapper) : BookService {
         log.info("[Book] getOne: found {}, author={}", result.name, result.author)
         return Result.success(result)
     }
+
+    override fun getAllBooks(): Result<Any?> {
+        TODO("Not yet implemented")
+    }
 }

src/main/kotlin/com/msksbr/bookmgr/service/impl/BorrowServiceImpl.kt

@@ -0,0 +1,27 @@
+package com.msksbr.bookmgr.service.impl
+
+import com.msksbr.bookmgr.service.BorrowService
+import org.springframework.stereotype.Service
+
+@Service
+class BorrowServiceImpl: BorrowService {
+    override fun getAllMyBorrows(userId: Long): Result<Any?> {
+        TODO("Not yet implemented")
+    }
+
+    override fun searchMyBorrows(query: String): Result<Any?> {
+        TODO("Not yet implemented")
+    }
+
+    override fun getOneBorrow(borrowId: Long): Result<Any?> {
+        TODO("Not yet implemented")
+    }
+
+    override fun borrowBook(bookId: Long): Result<Any?> {
+        TODO("Not yet implemented")
+    }
+
+    override fun returnBook(borrowId: Long): Result<Any?> {
+        TODO("Not yet implemented")
+    }
+}

src/main/kotlin/com/msksbr/bookmgr/service/impl/DashBoardServiceImpl.kt

@@ -11,6 +11,8 @@ import org.springframework.stereotype.Service
 * 仪表盘服务实现
 * 聚合 BookMapper 和 BorrowRecordMapper 提供全量数据查询
 */
+
+// @TODO: 拆分到book和admin borrow服务中
 @Service
 class DashBoardServiceImpl(
     private val bookMapper: BookMapper,