Add CMS features with admin interface and OAuth authentication integration

- Introduced Caddy server for serving frontend and API backend.
- Implemented admin dashboard for creating, editing, and managing events.
- Replaced session-based authentication with token-based OAuth using Gitea.
- Added support for drag-and-drop event reordering in the admin interface.
- Standardized Fastify route validation with JSON schemas.
- Enhanced authentication flow with cookie-based state and secure token storage.
- Reworked backend routes to handle publishing, event management, and content updates.
- Updated `Dockerfile.caddy` and `fly.toml` for deployment configuration.

docker-compose.yml

@@ -0,0 +1,38 @@
+services:
+  frontend:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    environment:
+      - BACKEND_URL=http://proxy:4321
+    depends_on:
+      - backend
+
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    env_file:
+      - ./backend/.env.local
+    environment:
+      - NODE_ENV=production
+      - PORT=8080
+      - DATABASE_PATH=/app/data/gallus_cms.db
+      - GIT_WORKSPACE_DIR=/app/workspace
+    volumes:
+      - backend_data:/app/data
+      - backend_workspace:/app/workspace
+
+  proxy:
+    build:
+      context: .
+      dockerfile: Dockerfile.caddy
+    depends_on:
+      - frontend
+      - backend
+    ports:
+      - "4321:80"
+
+volumes:
+  backend_data:
+  backend_workspace: