refactor: 清理代码、优化结构

- 移除订阅消息相关代码(WxSubscribeMessageService、subscribeTemplateId配置)
- 提取Result类为独立公共类(common.Result)
- 拆分Controller: WxLoginController(登录) + AppointmentController(预约)
- 引入Lombok(@Data/@Slf4j/@RequiredArgsConstructor)消除样板代码
- 修正WxLoginResult字段命名(session_key->sessionKey+@JsonProperty)
- MySQL驱动升级mysql-connector-java->mysql-connector-j
- updateStatus SQL增加status='pending'校验防并发重复审批
- pom.xml配置spring-boot-maven-plugin排除lombok

src/main/java/com/example/mini_program/service/AppointmentService.java

@@ -2,35 +2,105 @@ package com.example.mini_program.service;
 
 import com.example.mini_program.entity.VisitApplication;
 import com.example.mini_program.mapper.VisitApplicationMapper;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 
-@Service
-public class AppointmentService {
+import java.util.List;
+import java.util.UUID;
 
-    private static final Logger logger = LoggerFactory.getLogger(AppointmentService.class);
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class AppointmentService {
 
     private final VisitApplicationMapper visitApplicationMapper;
 
-    public AppointmentService(VisitApplicationMapper visitApplicationMapper) {
-        this.visitApplicationMapper = visitApplicationMapper;
-    }
-
     /**
      * 根据openid获取最新的一条预约记录
-     *
-     * @param openid 微信用户openid
-     * @return 最新的一条预约记录，没有则返回null
      */
     public VisitApplication getLatest(String openid) {
-        logger.info("查询用户最新预约记录, openid: {}", openid);
+        log.info("查询用户最新预约记录, openid: {}", openid);
         VisitApplication result = visitApplicationMapper.selectLatestByOpenid(openid);
         if (result != null) {
-            logger.info("找到预约记录, id: {}", result.getId());
+            log.info("找到预约记录, id: {}", result.getId());
         } else {
-            logger.info("未找到预约记录");
+            log.info("未找到预约记录");
         }
         return result;
     }
+
+    /**
+     * 获取用户所有预约记录（按创建时间倒序）
+     */
+    public List<VisitApplication> getList(String openid) {
+        log.info("查询用户预约列表, openid: {}", openid);
+        List<VisitApplication> list = visitApplicationMapper.selectListByOpenid(openid);
+        log.info("查询到 {} 条预约记录", list.size());
+        return list;
+    }
+
+    /**
+     * 创建预约记录
+     */
+    public VisitApplication create(VisitApplication record) {
+        record.setId(UUID.randomUUID().toString().replace("-", ""));
+        record.setStatus("pending");
+        record.setStatusText("待审核");
+        visitApplicationMapper.insert(record);
+        log.info("创建预约记录成功, id: {}, openid: {}", record.getId(), record.getOpenid());
+        return record;
+    }
+
+    /**
+     * 取消预约（仅pending状态可取消，需校验openid）
+     */
+    public boolean cancel(String id, String openid) {
+        log.info("取消预约, id: {}, openid: {}", id, openid);
+
+        VisitApplication existing = visitApplicationMapper.selectByIdAndOpenid(id, openid);
+        if (existing == null) {
+            log.warn("预约记录不存在或不属于该用户, id: {}, openid: {}", id, openid);
+            return false;
+        }
+        if (!"pending".equals(existing.getStatus())) {
+            log.warn("预约状态不允许取消, id: {}, status: {}", id, existing.getStatus());
+            return false;
+        }
+
+        int rows = visitApplicationMapper.updateStatusToCancelled(id, openid);
+        if (rows > 0) {
+            log.info("取消预约成功, id: {}", id);
+            return true;
+        }
+        log.warn("取消预约失败, id: {}", id);
+        return false;
+    }
+
+    /**
+     * 审批预约（通过/拒绝）
+     */
+    public boolean approve(String id, String status) {
+        log.info("审批预约, id: {}, status: {}", id, status);
+
+        VisitApplication existing = visitApplicationMapper.selectById(id);
+        if (existing == null) {
+            log.warn("预约记录不存在, id: {}", id);
+            return false;
+        }
+        if (!"pending".equals(existing.getStatus())) {
+            log.warn("预约状态不允许审批, id: {}, currentStatus: {}", id, existing.getStatus());
+            return false;
+        }
+
+        String statusText = "approved".equals(status) ? "已通过" : "已拒绝";
+        int rows = visitApplicationMapper.updateStatus(id, status, statusText);
+        if (rows <= 0) {
+            log.warn("审批更新失败, id: {}", id);
+            return false;
+        }
+
+        log.info("审批成功, id: {}, status: {}", id, statusText);
+        return true;
+    }
 }