feat(docker): add JWT authentication and improve server architecture

Add JWT token-based authentication to Docker server and client.
Refactor server architecture for better code organization and error handling.
Move Dockerfile to root deploy directory and update configuration.
Add comprehensive documentation and examples.

BREAKING CHANGE: Docker server now requires authentication by default.
Endpoints require JWT tokens when security.jwt_enabled is true in config.

crawl4ai/async_configs.py

@@ -47,7 +47,7 @@ def to_serializable_dict(obj: Any) -> Dict:
         return obj.isoformat()
         
     # Handle lists, tuples, and sets, and basically any iterable
-    if isinstance(obj, (list, tuple, set)) or hasattr(obj, '__iter__'):
+    if isinstance(obj, (list, tuple, set)) or hasattr(obj, '__iter__') and not isinstance(obj, dict):
         return [to_serializable_dict(item) for item in obj]
     
     # Handle frozensets, which are not iterable