feat :AIOJ 后端模块并更新项目结构

- 引入了新模块：gateway、judge service、question service、user service 和 UPMS。
- 在 gateway 和 user service 模块中创建了 package-info.java 文件用于文档说明。
- 更新了 pom.xml 文件以反映新的模块结构和依赖关系。
- 在 UserController 中实现了基本的用户资料管理端点。
- 为每个新模块添加了扁平化 POM 文件以有效管理依赖。
- 增强了项目属性，以实现更好的版本管理和模块间一致性。

aioj-backend-gateway/pom.xml

@@ -3,32 +3,29 @@
     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>
+        <groupId>cn.meowrain.aioj</groupId>
         <artifactId>ai-oj</artifactId>
-        <version>1.0-SNAPSHOT</version>
+        <version>${revision}</version>
     </parent>
 
     <artifactId>aioj-backend-gateway</artifactId>
+    <packaging>jar</packaging>
+    <description>AIOJ API网关服务</description>
 
-    <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <spring-cloud-gateway.version>4.3.2</spring-cloud-gateway.version>
-    </properties>
     <dependencies>
+        <!-- Spring Cloud Gateway (WebFlux) -->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-webflux</artifactId>
         </dependency>
-        <!-- Spring Cloud Gateway -->
         <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-gateway-server-webflux</artifactId>
-            <version>4.3.2</version>
         </dependency>
-        <!-- Nacos Discovery (parent 应已引入 alibaba 版本管理) -->
+        
+        <!-- Nacos 服务发现与配置 -->
         <dependency>
             <groupId>com.alibaba.cloud</groupId>
             <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
@@ -37,48 +34,50 @@
             <groupId>com.alibaba.cloud</groupId>
             <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
         </dependency>
+        
+        <!-- Sentinel 网关限流 -->
         <dependency>
             <groupId>com.alibaba.cloud</groupId>
             <artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
         </dependency>
-        <dependency>
-            <groupId>org.springframework.cloud</groupId>
-            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
-            <version>4.3.0</version>
-        </dependency>
         <dependency>
             <groupId>com.alibaba.csp</groupId>
             <artifactId>sentinel-datasource-extension</artifactId>
         </dependency>
+        
+        <!-- 负载均衡 -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
+        </dependency>
 
+        <!-- API文档聚合 -->
         <dependency>
             <groupId>com.github.xiaoymin</groupId>
             <artifactId>knife4j-gateway-spring-boot-starter</artifactId>
-            <version>4.5.0</version>
         </dependency>
 
+        <!-- 内部模块 (排除WebMVC相关依赖) -->
         <dependency>
-            <groupId>cn.meowrain</groupId>
+            <groupId>cn.meowrain.aioj</groupId>
             <artifactId>aioj-backend-common-core</artifactId>
-            <version>1.0-SNAPSHOT</version>
             <exclusions>
-                <!-- 🚫 必须排除：Spring MVC 核心 -->
                 <exclusion>
                     <groupId>org.springframework.boot</groupId>
                     <artifactId>spring-boot-starter-web</artifactId>
                 </exclusion>
-                <!-- 🚫 必须排除：Servlet API (Gateway用不到) -->
                 <exclusion>
                     <groupId>jakarta.servlet</groupId>
                     <artifactId>jakarta.servlet-api</artifactId>
                 </exclusion>
-                <!-- 🚫 必须排除：Spring WebMVC -->
                 <exclusion>
                     <groupId>org.springframework</groupId>
                     <artifactId>spring-webmvc</artifactId>
                 </exclusion>
             </exclusions>
         </dependency>
+        
+        <!-- 监控 -->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-actuator</artifactId>