Add initial Docker and Alembic setup

Introduce a `docker-compose.yml` to define the services for backend and database with health checks. Add Alembic configurations for database migrations and an initial empty migration. Include backend-related Docker setup with an entrypoint script for database migration execution.

docker-compose.yml

@@ -0,0 +1,51 @@
+services:
+  db:
+    image: postgres:17-alpine
+    volumes:
+      - postgres_data:/var/lib/postgresql/data/
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+      - POSTGRES_DB=eventspace
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    volumes:
+      - ./backend:/app
+      - ./uploads:/app/uploads
+    ports:
+      - "8000:8000"
+    environment:
+      - DATABASE_URL=postgresql://postgres:postgres@db:5432/eventspace
+      - SECRET_KEY=your_secret_key_here
+      - ENVIRONMENT=development
+      - DEBUG=true
+    depends_on:
+      db:
+        condition: service_healthy
+
+#  frontend:
+#    build:
+#      context: .
+#      dockerfile: frontend/Dockerfile
+#    volumes:
+#      - ./frontend:/app
+#      - /app/node_modules
+#    ports:
+#      - "3000:3000"
+#    environment:
+#      - NEXT_PUBLIC_API_URL=http://backend:8000
+#    depends_on:
+#      - backend
+
+volumes:
+  postgres_data: