fix(cd): 修復 Build 跳過時的 ImagePullBackOff 問題

問題: 當 Build Web/API 被跳過時，Deploy 仍更新 image tag 到不存在的版本
解決: 根據 build job 結果條件性更新 image

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/cd.yaml

@@ -222,9 +222,25 @@ jobs:
       - name: Deploy
         run: |
           cd k8s/awoooi-prod
-          kustomize edit set image \
-            "192.168.0.110:5000/library/web:IMAGE_TAG_PLACEHOLDER=${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}-web:${{ steps.tag.outputs.tag }}" \
-            "192.168.0.110:5000/library/api:IMAGE_TAG_PLACEHOLDER=${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}-api:${{ steps.tag.outputs.tag }}"
+          TAG="${{ steps.tag.outputs.tag }}"
+
+          # 只更新實際建構的 image (避免 ImagePullBackOff)
+          if [ "${{ needs.build-api.result }}" = "success" ]; then
+            echo "📦 更新 API image: ${{ env.IMAGE_PREFIX }}-api:${TAG}"
+            kustomize edit set image \
+              "192.168.0.110:5000/library/api:IMAGE_TAG_PLACEHOLDER=${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}-api:${TAG}"
+          else
+            echo "⏭️ 跳過 API image 更新 (build skipped)"
+          fi
+
+          if [ "${{ needs.build-web.result }}" = "success" ]; then
+            echo "📦 更新 Web image: ${{ env.IMAGE_PREFIX }}-web:${TAG}"
+            kustomize edit set image \
+              "192.168.0.110:5000/library/web:IMAGE_TAG_PLACEHOLDER=${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}-web:${TAG}"
+          else
+            echo "⏭️ 跳過 Web image 更新 (build skipped)"
+          fi
+
           kubectl apply -k .
 
       - name: Wait for rollout