feat: improve pipeline architecture with proper dependencies

- Deploy-dev now depends on build completion (no race conditions)
- Remove duplicate build logic from deploy-dev workflow
- Use commit-specific image tags for reliable deployments
- Deploy workflows now wait for build to complete before deploying
- Consistent image tagging across all environments (branch-commit)
- Eliminates race conditions between build and deploy

Pipeline flow: push → build → deploy → test → promote

.github/workflows/deploy-prod.yml

@@ -41,7 +41,7 @@ jobs:
         if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
           IMAGE_TAG="${{ github.event.inputs.image_tag || 'latest' }}"
         else
-          # For auto-promotion, use the latest successful build
+          # For production deployment, use the main branch commit tag
           IMAGE_TAG="main-$(echo "${{ github.sha }}" | cut -c1-7)"
         fi
         echo "IMAGE_TAG=$IMAGE_TAG" >> $GITHUB_ENV