refactor: make optimized Dockerfile the default - remove full variant

- Rename Dockerfile.optimized to Dockerfile (now the default)
- Keep old Dockerfile as Dockerfile.old for reference
- Update GitHub Actions to use default Dockerfile
- Remove build-full job - only one image variant now
- Remove docker-compose.optimized.yml and other variants
- Update all documentation to reflect single image approach

The optimized 283MB image is now the only n8n-MCP Docker image.
This simplifies the user experience and provides the best solution
for all use cases.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.github/workflows/docker-build.yml

@@ -17,8 +17,8 @@ env:
   IMAGE_NAME: ${{ github.repository }}
 
 jobs:
-  build-optimized:
-    name: Build Optimized Docker Image
+  build:
+    name: Build Docker Image
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -56,11 +56,10 @@ jobs:
             type=sha,prefix={{branch}}-,format=short
             type=raw,value=latest,enable={{is_default_branch}}
             
-      - name: Build and push optimized Docker image
+      - name: Build and push Docker image
         uses: docker/build-push-action@v5
         with:
           context: .
-          file: ./Dockerfile.optimized
           platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
@@ -70,59 +69,6 @@ jobs:
           build-args: |
             BUILDKIT_INLINE_CACHE=1
           provenance: false
-          
-  # Keep standard build as 'full' variant
-  build-full:
-    name: Build Full Docker Image (with n8n packages)
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-      
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-        
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-        
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-        
-      - name: Log in to GitHub Container Registry
-        if: github.event_name != 'pull_request'
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-          
-      - name: Extract metadata for full variant
-        id: meta-full
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          tags: |
-            type=ref,event=branch,suffix=-full
-            type=ref,event=pr,suffix=-full
-            type=semver,pattern={{version}}-full
-            type=semver,pattern={{major}}.{{minor}}-full
-            type=raw,value=full,enable={{is_default_branch}}
-            
-      - name: Build and push full Docker image
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          file: ./Dockerfile
-          platforms: linux/amd64,linux/arm64
-          push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta-full.outputs.tags }}
-          labels: ${{ steps.meta-full.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
-          build-args: |
-            BUILDKIT_INLINE_CACHE=1
-          provenance: false
 
   # Nginx build commented out until Phase 2
   # build-nginx: