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/WxLoginService.java

@@ -1,6 +1,8 @@
 package com.example.mini_program.service;
 
 import com.example.mini_program.config.WxMiniAppConfig;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.Data;
 import org.json.JSONObject;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -11,7 +13,8 @@ import org.springframework.web.client.RestTemplate;
 public class WxLoginService {
 
     private static final Logger logger = LoggerFactory.getLogger(WxLoginService.class);
-    private static final String JSCODE2SESSION_URL = "https://api.weixin.qq.com/sns/jscode2session?appid=%s&secret=%s&js_code=%s&grant_type=authorization_code";
+    private static final String JSCODE2SESSION_URL =
+            "https://api.weixin.qq.com/sns/jscode2session?appid=%s&secret=%s&js_code=%s&grant_type=authorization_code";
 
     private final WxMiniAppConfig wxMiniAppConfig;
     private final RestTemplate restTemplate;
@@ -23,9 +26,6 @@ public class WxLoginService {
 
     /**
      * 调用微信接口用code换取openid
-     *
-     * @param code 小程序调用wx.login获取的code
-     * @return 登录结果，包含openid等信息
      */
     public WxLoginResult code2Session(String code) {
         String url = String.format(JSCODE2SESSION_URL,
@@ -33,17 +33,16 @@ public class WxLoginService {
                 wxMiniAppConfig.getSecret(),
                 code);
 
-        logger.info("调用微信jscode2session接口，code: {}", code);
+        logger.info("调用微信jscode2session接口, code: {}", code);
 
         try {
-            // 微信返回text/plain，手动解析JSON字符串
             String response = restTemplate.getForObject(url, String.class);
             logger.info("微信返回原始结果: {}", response);
 
             JSONObject json = new JSONObject(response);
             WxLoginResult result = new WxLoginResult();
             result.setOpenid(json.optString("openid"));
-            result.setSession_key(json.optString("session_key"));
+            result.setSessionKey(json.optString("session_key"));
             result.setUnionid(json.optString("unionid"));
             result.setErrcode(json.optString("errcode"));
             result.setErrmsg(json.optString("errmsg"));
@@ -60,52 +59,15 @@ public class WxLoginService {
         }
     }
 
+    @Data
     public static class WxLoginResult {
 
-        private String session_key;
+        @JsonProperty("session_key")
+        private String sessionKey;
+
         private String unionid;
         private String openid;
         private String errcode;
         private String errmsg;
-
-        public String getSession_key() {
-            return session_key;
-        }
-
-        public void setSession_key(String session_key) {
-            this.session_key = session_key;
-        }
-
-        public String getUnionid() {
-            return unionid;
-        }
-
-        public void setUnionid(String unionid) {
-            this.unionid = unionid;
-        }
-
-        public String getOpenid() {
-            return openid;
-        }
-
-        public void setOpenid(String openid) {
-            this.openid = openid;
-        }
-
-        public String getErrcode() {
-            return errcode;
-        }
-
-        public void setErrcode(String errcode) {
-            this.errcode = errcode;
-        }
-
-        public String getErrmsg() {
-            return errmsg;
-        }
-
-        public void setErrmsg(String errmsg) {
-            this.errmsg = errmsg;
-        }
     }
 }