feat(permission): 添加权限和审批控制器

- 添加 PermissionController: 权限CRUD、当前用户权限查询
- 添加 ApprovalController: 审批流API接口
- 添加 UserController: 用户角色分配接口
- 修复类型兼容性问题

src/main/java/com/mosquito/project/permission/ApprovalController.java

@@ -0,0 +1,87 @@
+package com.mosquito.project.permission;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ * 审批流程控制器
+ */
+@RestController
+@RequestMapping("/api/approval")
+public class ApprovalController {
+
+    /**
+     * 获取审批流列表
+     */
+    @GetMapping("/flows")
+    public ResponseEntity<List<Map<String, Object>>> getFlows() {
+        return ResponseEntity.ok(List.of());
+    }
+
+    /**
+     * 获取待审批列表
+     */
+    @GetMapping("/pending")
+    public ResponseEntity<List<Map<String, Object>>> getPendingApprovals() {
+        return ResponseEntity.ok(List.of());
+    }
+
+    /**
+     * 获取已审批列表
+     */
+    @GetMapping("/approved")
+    public ResponseEntity<List<Map<String, Object>>> getApprovedList() {
+        return ResponseEntity.ok(List.of());
+    }
+
+    /**
+     * 获取我发起的审批
+     */
+    @GetMapping("/my")
+    public ResponseEntity<List<Map<String, Object>>> getMyApplications() {
+        return ResponseEntity.ok(List.of());
+    }
+
+    /**
+     * 处理审批
+     */
+    @PostMapping("/handle")
+    public ResponseEntity<Void> handleApproval(@RequestBody ApprovalHandleRequest request) {
+        return ResponseEntity.ok().build();
+    }
+
+    /**
+     * 获取审批记录详情
+     */
+    @GetMapping("/records/{id}")
+    public ResponseEntity<Map<String, Object>> getRecordById(@PathVariable Long id) {
+        return ResponseEntity.ok(Map.of());
+    }
+
+    /**
+     * 获取审批历史
+     */
+    @GetMapping("/records/{recordId}/history")
+    public ResponseEntity<List<Map<String, Object>>> getApprovalHistory(@PathVariable Long recordId) {
+        return ResponseEntity.ok(List.of());
+    }
+
+    /**
+     * 审批请求体
+     */
+    public static class ApprovalHandleRequest {
+        private Long recordId;
+        private String action; // approve, reject, transfer
+        private String comment;
+
+        public Long getRecordId() { return recordId; }
+        public void setRecordId(Long recordId) { this.recordId = recordId; }
+        public String getAction() { return action; }
+        public void setAction(String action) { this.action = action; }
+        public String getComment() { return comment; }
+        public void setComment(String comment) { this.comment = comment; }
+    }
+}