fix: force no-cache build to ensure composer is installed in image

.gitea/workflows/deploy-demo.yaml

@@ -15,7 +15,8 @@ jobs:
       - name: Step 1 - Build & Deploy Containers
         run: |
           # 機器人現在是以「容器模式」預設執行的，我需要確保它能操作宿主機 Docker
-          WWWGROUP=1000 WWWUSER=1000 docker compose -f compose.yaml up -d --build --wait
+          WWWGROUP=1000 WWWUSER=1000 docker compose -f compose.yaml build --no-cache
+          WWWGROUP=1000 WWWUSER=1000 docker compose -f compose.yaml up -d --wait
 
       - name: Step 2 - Composer & NPM & Initialization
         run: |