[REFACTOR] 簡化 CI/CD 部署腳本 - 從根本解決 tar 問題

問題根源：
- tar 的 'file changed as we read it' 是警告 (exit 1)，非錯誤
- 之前用 PIPESTATUS、pipefail toggle、wait_for_container 等 workaround
  處理，導致腳本越來越複雜且脆弱

根本解法：
1. tar --warning=no-file-changed: 讓 tar 忽略此警告並維持 exit 0
2. 三個容器共享同一份 volume，只需同步一次到主容器
3. 移除所有 workaround 程式碼 (PIPESTATUS/pipefail/wait_for_container)

Step 2 從 ~50 行縮減至 ~15 行。

.gitea/workflows/deploy-demo.yaml

@@ -40,51 +40,15 @@ jobs:
           WWWGROUP=1000 WWWUSER=1000 docker compose -f compose.yaml up -d --build --wait
 
       - name: Step 2 - Deploy Code
-        shell: bash
         run: |
-          # 等待容器進入 running 狀態 (最多 30 秒)
-          wait_for_container() {
-            local container=$1
-            local max_attempts=15
-            local attempt=0
-            while [ $attempt -lt $max_attempts ]; do
-              local state=$(docker inspect --format='{{.State.Status}}' "$container" 2>/dev/null)
-              if [ "$state" = "running" ]; then
-                return 0
-              fi
-              attempt=$((attempt + 1))
-              echo "    Waiting for $container (state=$state, attempt $attempt/$max_attempts)..."
-              sleep 2
-            done
-            echo "!!! Error: $container did not reach running state (last state=$state)"
-            return 1
-          }
-
           echo ">>> Syncing code to star-cloud-laravel..."
-          # 三個容器共享同一份 volume (.:/var/www/html)，
-          # 只需同步至主容器一次，queue/mqtt-worker 會自動看到變更。
-          #
-          # 注意：tar 在檔案讀取過程中若被修改會回傳 exit 1 (警告，非錯誤)。
-          # Gitea Actions 預設啟用 pipefail，會讓此警告變成管線失敗，故需暫時關閉。
-          set +o pipefail
-          tar --exclude='.git' --exclude='node_modules' --exclude='vendor' --exclude='storage' --exclude='bootstrap/cache' -cf - . \
-            | docker exec -i star-cloud-laravel tar -xf - -C /var/www/html/
-          local_tar=${PIPESTATUS[0]} local_docker=${PIPESTATUS[1]}
-          set -o pipefail
+          # --warning=no-file-changed: 抑制 "file changed as we read it" 警告並維持 exit 0
+          # 三個容器 (laravel, queue, mqtt-worker) 共享同一份 volume (.:/var/www/html)，只需同步一次
+          tar --warning=no-file-changed \
+              --exclude='.git' --exclude='node_modules' --exclude='vendor' \
+              --exclude='storage' --exclude='bootstrap/cache' \
+              -cf - . | docker exec -i star-cloud-laravel tar -xf - -C /var/www/html/
 
-          echo "    Result: tar=$local_tar, docker=$local_docker"
-          if [ "$local_tar" -gt 1 ] || [ "$local_docker" -ne 0 ]; then
-            echo "!!! Error: Sync failed (tar=$local_tar, docker=$local_docker)"
-            exit 1
-          fi
-
-          # 程式碼同步後，queue/mqtt-worker 可能因檔案變動而短暫重啟，等待它們恢復
-          echo ">>> Waiting for worker containers to stabilize..."
-          wait_for_container star-cloud-queue || exit 1
-          wait_for_container star-cloud-mqtt-worker || exit 1
-          echo ">>> All containers are running."
-
-          # 設定權限
           docker exec star-cloud-laravel sh -c "
             chown -R 1000:1000 /var/www/html &&
             mkdir -p /.npm && chown -R 1000:1000 /.npm &&