chore: Flutter mobile app, CI, and dev tooling

- mobile/: Flutter/Dart merchant mobile app skeleton
- .github/: GitHub Actions CI workflows
- .dockerignore: exclude host node_modules from build context
- .cursorrules: Cursor IDE project rules
- .claude/: Claude Code project settings and launch config

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

.github/workflows/deploy.yml

@@ -0,0 +1,20 @@
+name: Deploy
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build-images:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build API image
+        run: docker build -f docker/api/Dockerfile -t meezi-api:${{ github.ref_name }} .
+      - name: Build Web image
+        run: docker build -f docker/web/Dockerfile -t meezi-web:${{ github.ref_name }} .
+      - name: Deploy note
+        run: |
+          echo "Push images to your registry and deploy on Arvan per DEPLOY.md"
+          echo "Required secrets: registry credentials, connection strings (not in repo)"