chore: 优化 Java 安装步骤，移除缓存和镜像下载，直接使用官方设置

.gitea/workflows/expo-build-apk.yaml

@@ -38,37 +38,12 @@ jobs:
       - name: 📦 Install dependencies
         run: pnpm install
 
-      - name: ⚡ Cache Java installation
+      - name: 🏗 Setup Java
-        uses: actions/cache@v3
+        uses: actions/setup-java@v3
-        id: java-cache
         with:
-          path: /opt/java
+          distribution: 'temurin'
-          key: java-17-${{ runner.os }}-v2
+          java-version: '17'
-
+          cache: 'gradle'
-      - name: 🏗 Setup Java (with China mirror)
-        if: steps.java-cache.outputs.cache-hit != 'true'
-        run: |
-          # 使用清华大学镜像下载 Java (更快)
-          echo "Downloading Java 17 from Tsinghua mirror..."
-          wget -q --timeout=30 --tries=3 \
-            https://mirrors.tuna.tsinghua.edu.cn/Adoptium/17/jdk/x64/linux/OpenJDK17U-jdk_x64_linux_hotspot_17.0.9_9.tar.gz \
-            -O java17.tar.gz
-          
-          # 解压并安装
-          tar -xf java17.tar.gz
-          sudo mkdir -p /opt
-          sudo mv jdk-17.0.9+9 /opt/java
-          sudo chmod -R 755 /opt/java
-          
-      - name: ⚡ Configure Java environment
-        run: |
-          echo "JAVA_HOME=/opt/java" >> $GITHUB_ENV
-          echo "/opt/java/bin" >> $GITHUB_PATH
-          
-      - name: ⚡ Verify Java installation
-        run: |
-          java -version
-          echo "JAVA_HOME: $JAVA_HOME"
 
       - name: ⚡ Configure Java mirrors for speed
         run: |