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.

fly.toml

@@ -4,11 +4,14 @@ kill_signal = "SIGINT"
 kill_timeout = 5
 
 [build]
-  dockerfile = "Dockerfile"
+  dockerfile = "Dockerfile.fly"
 
 [env]
-  PORT = "3000"
+  PORT = "3000"            # Caddy (serves frontend + proxies /api/*)
   NODE_ENV = "production"
+  BACKEND_PORT = "8080"    # Fastify backend will listen here
+  DATABASE_PATH = "/app/data/gallus_cms.db"
+  GIT_WORKSPACE_DIR = "/app/workspace"
 
 [http_service]
   internal_port = 3000
@@ -39,4 +42,12 @@ kill_timeout = 5
 [[vm]]
   memory = "512MB"
   cpu_kind = "shared"
-  cpus = 1
+  cpus = 1
+
+[[mounts]]
+  source = "gallus_data"
+  destination = "/app/data"
+
+[[mounts]]
+  source = "gallus_workspace"
+  destination = "/app/workspace"