fix: 修复 GitHub Actions 部署配置

前端部署修复：
- 修复工作目录：yudao-ui-admin → yudao-ui-admin-vue3
- 修复包管理器：yarn → pnpm
- 更新 pnpm 版本：6.15.1 → 8
- 修复缓存路径：yarn.lock → pnpm-lock.yaml
- 更新 actions 版本：v2 → v3

后端部署优化：
- 更新 actions 版本到最新
- 添加 artifact 上传功能
- 简化 Java 版本矩阵（只保留 17）

.github/workflows/maven.yml

@@ -14,17 +14,21 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        java: [ '8', '11', '17' ]
-
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up JDK ${{ matrix.Java }}
-      uses: actions/setup-java@v2
+    - uses: actions/checkout@v3
+    
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
       with:
-        java-version: ${{ matrix.java }}
+        java-version: '17'
         distribution: 'temurin'
         cache: maven
+    
     - name: Build with Maven
       run: mvn -B package --file pom.xml -Dmaven.test.skip=true
+    
+    - name: Upload artifact
+      uses: actions/upload-artifact@v3
+      with:
+        name: yudao-server
+        path: yudao-server/target/*.jar