fix(ci): retry apk build after clearing corrupted Gradle cache

Handle sporadic Gradle wrapper zip corruption on Jenkins by retrying
build once after removing ~/.gradle/wrapper/dists.

Made-with: Cursor

Jenkinsfile

@@ -159,6 +159,8 @@ pipeline {
                             
                             echo "  - 开始构建 APK 参数: \$EXTRA_ARGS"
                             echo "  - 开始执行 flutter build apk（构建期间每30秒输出一次心跳）..."
+
+                            run_build_with_heartbeat() {
                                 (fvm flutter build apk --release \$EXTRA_ARGS) &
                                 BUILD_PID=\$!
                                 while kill -0 \$BUILD_PID 2>/dev/null; do
@@ -166,6 +168,14 @@ pipeline {
                                     sleep 30
                                 done
                                 wait \$BUILD_PID
+                                return \$?
+                            }
+
+                            if ! run_build_with_heartbeat; then
+                                echo "  ⚠️ 首次构建失败，尝试清理 Gradle wrapper 缓存后重试一次..."
+                                rm -rf "\$HOME/.gradle/wrapper/dists"
+                                run_build_with_heartbeat
+                            fi
                         """
                         echo "  ✅ ${currentApp} Android APK 构建完成"
                     }