✨ feat: add SQLite persistence, multi-tenancy, auto-sync, and CI/Docker improvements (#1)

Replace in-memory storage with SQLite (WAL mode), add workspace-based
multi-tenancy with auto-detection via server.listRoots(), and embed the
canvas server into the MCP process for single-process operation.

🔧 Core enhancements:
- SQLite persistence with versioning, element history, and search
- Multi-tenancy: isolated canvases per workspace (SHA-256 tenant IDs)
- Embedded canvas lifecycle (single node process starts MCP + canvas)
- Auto-sync with 3s debounce and manual override toggle
- Configurable canvas port via CANVAS_PORT env var
- 6 new MCP tools (search, history, tenants, projects)
- Workspace switcher UI with dropdown search
- Sync normalization to prevent bound-text breakage on reload

🐳 Docker & CI improvements:
- BuildKit cache mounts for faster npm installs across builds
- Skip native compilation in frontend-builder stage (--ignore-scripts)
- Build only linux/amd64 on PRs, multi-arch on push to main
- Docker Hub registry with proper build tools for better-sqlite3
- CI and Docker status check gates (github/ci-status-check, github/docker-build-check)

📦 Package & publishing:
- Renamed to @sanjibdevnath/mcp-excalidraw-local (v3.0.0)
- Updated npm-publish workflow for scoped package
- Updated bin entry, keywords, and files list

📝 Documentation:
- README with UI screenshots, architecture diagram, and full feature docs
- Updated agent skill with 32-tool cheatsheet and workflow playbooks
- Fork attribution and upstream comparison table

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/docker.yml

@@ -10,9 +10,9 @@ on:
   workflow_dispatch:
 
 env:
-  REGISTRY: ghcr.io
-  IMAGE_NAME_MCP: ${{ github.repository }}
-  IMAGE_NAME_CANVAS: ${{ github.repository }}-canvas
+  REGISTRY: docker.io
+  IMAGE_NAME_MCP: sanjibdevnath/mcp-excalidraw-local
+  IMAGE_NAME_CANVAS: sanjibdevnath/mcp-excalidraw-local-canvas
 
 jobs:
   build-and-push-mcp:
@@ -20,7 +20,6 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: read
-      packages: write
 
     steps:
       - name: Checkout code
@@ -29,12 +28,12 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Log in to GitHub Container Registry
+      - name: Log in to Docker Hub
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Extract metadata for MCP Server
         id: meta
@@ -55,19 +54,18 @@ jobs:
         with:
           context: .
           file: ./Dockerfile
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
-          platforms: linux/amd64,linux/arm64
+          platforms: ${{ github.event_name == 'pull_request' && 'linux/amd64' || 'linux/amd64,linux/arm64' }}
 
   build-and-push-canvas:
     name: Build and Push Canvas Server Image
     runs-on: ubuntu-latest
     permissions:
       contents: read
-      packages: write
 
     steps:
       - name: Checkout code
@@ -76,12 +74,12 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Log in to GitHub Container Registry
+      - name: Log in to Docker Hub
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Extract metadata for Canvas Server
         id: meta
@@ -102,39 +100,30 @@ jobs:
         with:
           context: .
           file: ./Dockerfile.canvas
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
-          platforms: linux/amd64,linux/arm64
+          platforms: ${{ github.event_name == 'pull_request' && 'linux/amd64' || 'linux/amd64,linux/arm64' }}
 
   test-docker-images:
     name: Test Docker Images
     needs: [build-and-push-mcp, build-and-push-canvas]
+    if: github.event_name != 'pull_request'
     runs-on: ubuntu-latest
 
     steps:
-      - name: Log in to GitHub Container Registry
+      - name: Log in to Docker Hub
         uses: docker/login-action@v3
         with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Determine image tag
-        id: tag
-        run: |
-          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
-            echo "value=pr-${{ github.event.pull_request.number }}" >> $GITHUB_OUTPUT
-          else
-            echo "value=${{ github.ref_name }}" >> $GITHUB_OUTPUT
-          fi
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Test Canvas Server image
         run: |
-          docker pull ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_CANVAS }}:${{ steps.tag.outputs.value }}
-          docker run -d -p 3000:3000 --name test-canvas ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_CANVAS }}:${{ steps.tag.outputs.value }}
+          docker pull ${{ env.IMAGE_NAME_CANVAS }}:latest
+          docker run -d -p 3000:3000 --name test-canvas ${{ env.IMAGE_NAME_CANVAS }}:latest
           sleep 10
           curl -f http://localhost:3000/health || exit 1
           docker logs test-canvas
@@ -142,5 +131,29 @@ jobs:
 
       - name: Test MCP Server image
         run: |
-          docker pull ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_MCP }}:${{ steps.tag.outputs.value }}
+          docker pull ${{ env.IMAGE_NAME_MCP }}:latest
           echo "MCP Server image pulled successfully"
+
+  docker-status:
+    runs-on: ubuntu-latest
+    continue-on-error: false
+    name: Docker Build Status Check
+    needs: [build-and-push-mcp, build-and-push-canvas]
+    if: always()
+    permissions:
+      statuses: write
+    steps:
+      - name: Failed
+        id: failed
+        if: contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
+        run: |
+          curl -X POST -H "Content-Type: application/json" -H "Authorization: token ${{ github.token }}" \
+          -d '{ "state" : "failure" , "context" : "github/docker-build-check" , "description" : "Docker build failed", "target_url" : "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}" }' \
+          https://api.github.com/repos/${{ github.repository }}/statuses/${{ github.sha }}
+          exit 1
+      - name: Success
+        if: steps.failed.conclusion == 'skipped'
+        run: |
+          curl -X POST -H "Content-Type: application/json" -H "Authorization: token ${{ github.token }}" \
+          -d '{ "state" : "success" , "context" : "github/docker-build-check" , "description" : "Docker build passed", "target_url" : "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}" }' \
+          https://api.github.com/repos/${{ github.repository }}/statuses/${{ github.sha }}