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-gateway/pom.xml

@@ -50,11 +50,10 @@
             <groupId>com.alibaba.csp</groupId>
             <artifactId>sentinel-datasource-extension</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>
+            <artifactId>knife4j-gateway-spring-boot-starter</artifactId>
             <version>4.5.0</version>
         </dependency>