feat: initial scaffold with Event Management, Participant Management, and Budget Management

- Express backend with JWT auth, PostgreSQL, full CRUD APIs
- React + Vite + TailwindCSS frontend with RTL Hebrew UI
- Event Creation & Management (create/edit/delete/list events)
- Participant Management (add/edit/delete/status tracking per event)
- Budget Management (income/expense tracking with balance summary)
- Docker Compose setup with PostgreSQL
- /health endpoint with commit-id and DB status

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

docker-compose.yml

@@ -0,0 +1,36 @@
+version: '3.8'
+
+services:
+  app:
+    build: .
+    expose:
+      - "3000"
+    environment:
+      - DATABASE_URL=postgresql://postgres:postgres@postgres:5432/airewit
+      - JWT_SECRET=${JWT_SECRET:-airewit-jwt-secret-change-in-production}
+      - NODE_ENV=production
+      - PORT=3000
+    depends_on:
+      postgres:
+        condition: service_healthy
+    restart: unless-stopped
+
+  postgres:
+    image: postgres:15-alpine
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+      - POSTGRES_DB=airewit
+    expose:
+      - "5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    restart: unless-stopped
+
+volumes:
+  postgres_data: