feat: 添加swagger公共模块并重构API文档依赖

- 新增 aioj-backend-common-swagger 模块用于统一管理API文档相关依赖
- 从 BOM 中移除 knife4j 依赖，改为按需引入到各服务模块
- 更新 auth、gateway、user-service、upms 等服务的 pom.xml 配置
- 显式指定 springdoc-openapi 版本以兼容 Spring Boot 3.5.x
- 添加依赖排除以避免版本冲突

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

aioj-backend-common/aioj-backend-common-mybatis/pom.xml

@@ -44,11 +44,6 @@
             <groupId>com.mysql</groupId>
             <artifactId>mysql-connector-j</artifactId>
         </dependency>
-        <!-- https://mvnrepository.com/artifact/com.github.xiaoymin/knife4j-openapi3-jakarta-spring-boot-starter -->
-        <dependency>
-            <groupId>com.github.xiaoymin</groupId>
-            <artifactId>knife4j-openapi3-jakarta-spring-boot-starter</artifactId>
-        </dependency>
 
         <dependency>
             <groupId>org.springframework.security</groupId>