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

pom.xml

@@ -30,6 +30,13 @@
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
 
+        <!-- Lombok -->
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
         <!-- Spring Boot Test -->
         <dependency>
             <groupId>org.springframework.boot</groupId>
@@ -39,10 +46,10 @@
 
         <!-- MySQL驱动 -->
         <dependency>
-            <groupId>mysql</groupId>
-            <artifactId>mysql-connector-java</artifactId>
-            <version>8.0.33</version>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
         </dependency>
+
         <!-- MyBatis -->
         <dependency>
             <groupId>org.mybatis.spring.boot</groupId>
@@ -64,6 +71,14 @@
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
+                <configuration>
+                    <excludes>
+                        <exclude>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                        </exclude>
+                    </excludes>
+                </configuration>
             </plugin>
         </plugins>
     </build>