[FIX] 強化 CI/CD Step 2 部署腳本與錯誤診斷

1. 改進 deploy_to 函式，同時驗證 tar 與 docker exec 的結束碼，避免靜默失敗。
2. 增加同步過程的日誌輸出 (tar/docker status)，提升故障排查效率。
3. 確保任一容器同步失敗時立即中斷流程，防止不完整的部署。

.gitea/workflows/deploy-demo.yaml

@@ -43,13 +43,28 @@ jobs:
         shell: bash
         run: |
           deploy_to() {
-            tar --exclude='.git' --exclude='node_modules' --exclude='vendor' --exclude='storage' --exclude='bootstrap/cache' -cf - . 2>/dev/null | docker exec -i "$1" tar -xf - -C /var/www/html/
-            # tar exit 1 = "file changed as we read it" (non-fatal), exit 2+ = fatal
-            [ "${PIPESTATUS[0]}" -le 1 ]
+            local container=$1
+            echo ">>> Syncing code to $container..."
+            tar --exclude='.git' --exclude='node_modules' --exclude='vendor' --exclude='storage' --exclude='bootstrap/cache' -cf - . \
+              | docker exec -i "$container" tar -xf - -C /var/www/html/
+            
+            local tar_status=${PIPESTATUS[0]}
+            local docker_status=${PIPESTATUS[1]}
+            
+            echo "    Result: tar=$tar_status, docker=$docker_status"
+            
+            if [ $tar_status -le 1 ] && [ $docker_status -eq 0 ]; then
+              return 0
+            else
+              echo "!!! Error: Sync failed for $container"
+              return 1
+            fi
           }
-          deploy_to star-cloud-laravel
-          deploy_to star-cloud-queue
-          deploy_to star-cloud-mqtt-worker
+          
+          # 依序執行同步，任一失敗即中斷
+          deploy_to star-cloud-laravel && \
+          deploy_to star-cloud-queue && \
+          deploy_to star-cloud-mqtt-worker && \
           docker exec star-cloud-laravel sh -c "
             chown -R 1000:1000 /var/www/html &&
             mkdir -p /.npm && chown -R 1000:1000 /.npm &&