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-swagger/pom.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>cn.meowrain</groupId>
+        <artifactId>aioj-backend-common</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <groupId>cn.meowrain.aioj.backend.common.swagger</groupId>
+    <artifactId>aioj-backend-common-swagger</artifactId>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>