feat(docker): add Docker service integration and config serialization

Add Docker service integration with FastAPI server and client implementation.
Implement serialization utilities for BrowserConfig and CrawlerRunConfig to support
Docker service communication. Clean up imports and improve error handling.

- Add Crawl4aiDockerClient class
- Implement config serialization/deserialization
- Add FastAPI server with streaming support
- Add health check endpoint
- Clean up imports and type hints

crawl4ai/__init__.py

@@ -1,4 +1,5 @@
 # __init__.py
+import warnings
 
 from .async_webcrawler import AsyncWebCrawler, CacheMode
 from .async_configs import BrowserConfig, CrawlerRunConfig
@@ -28,6 +29,7 @@ from .async_dispatcher import (
     DisplayMode,
     BaseDispatcher
 )
+from .docker_client import Crawl4aiDockerClient
 from .hub import CrawlerHub
 
 __all__ = [
@@ -59,12 +61,13 @@ __all__ = [
     "CrawlerMonitor",
     "DisplayMode",
     "MarkdownGenerationResult",
+    "Crawl4aiDockerClient",
 ]
 
 
 def is_sync_version_installed():
     try:
-        import selenium
+        import selenium # noqa
 
         return True
     except ImportError:
@@ -85,9 +88,6 @@ else:
     # import warnings
     # print("Warning: Synchronous WebCrawler is not available. Install crawl4ai[sync] for synchronous support. However, please note that the synchronous version will be deprecated soon.")
 
-import warnings
-from pydantic import warnings as pydantic_warnings
-
 # Disable all Pydantic warnings
 warnings.filterwarnings("ignore", module="pydantic")
-# pydantic_warnings.filter_warnings()
+# pydantic_warnings.filter_warnings()