feat: initial commit — local services (backend + manager dashboard + waiter PWA)

Includes all work to date:
- local_backend: FastAPI backend with products, orders, tables, shifts, cloud sync
- manager_dashboard: React manager UI with product/category management, reports, settings
- waiter_pwa: React PWA for waiter devices
- Category reparent endpoint and UI
- Waiter domain: local_ip sent on heartbeat, waiter_domain persisted from cloud response
- QR code modal in AppInfoTab for waiter domain
- Product form: number input spinners removed, category pre-selected on new product
- Category row: count badge moved to far right

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,39 @@
+# Environment
+.env
+*.env
+
+# Database
+*.db
+*.db-shm
+*.db-wal
+
+# License state (runtime file)
+license_state.json
+
+# Python
+__pycache__/
+*.py[cod]
+*.pyo
+.venv/
+venv/
+env/
+
+# Node (for future frontends)
+node_modules/
+dist/
+.next/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Fiscal driver tests & documentation
+FISCAL-DRIVER-TESTS/
+
+# Runtime data (databases, uploaded images)
+data/
+
+# SSL certificates (generated per-machine with mkcert — never commit)
+certs/*.pem
+certs/*.crt
+certs/*.key