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>

mobile/meezi_pos/README.md

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+# meezi_pos
+
+Tablet POS app for Meezi (parallel to `meezi_app` customer app).
+
+## Phase 1 (current)
+
+- Flutter 3 + Riverpod + GoRouter
+- Login shell → POS shell
+- `X-Meezi-Terminal-Id` header (wire in Dio client)
+
+## Phase 2
+
+- Drift SQLite: menu cache, cart, sync queue
+- Full POS flow + `bluetooth_print` / `esc_pos_utils_plus`
+- Same OTP API as dashboard
+
+## Run
+
+```bash
+cd mobile/meezi_pos
+flutter pub get
+flutter run
+```
+
+Set API base URL via `--dart-define=API_URL=http://10.0.2.2:5080` (Android emulator).