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

deploy/docker/utils.py

@@ -0,0 +1,36 @@
+import json
+from datetime import datetime
+
+class CrawlJSONEncoder(json.JSONEncoder):
+    """Custom JSON encoder for crawler results"""
+    def default(self, obj):
+        if isinstance(obj, datetime):
+            return obj.isoformat()
+        if isinstance(obj, bytes):
+            return obj.decode('utf-8', errors='ignore')
+        if hasattr(obj, 'model_dump'):
+            return obj.model_dump()
+        if hasattr(obj, '__dict__'):
+            return {k: v for k, v in obj.__dict__.items() if not k.startswith('_')}
+        return str(obj)  # Fallback to string representation
+
+def serialize_result(result) -> dict:
+    """Safely serialize a crawler result"""
+    try:
+        # Convert to dict handling special cases
+        if hasattr(result, 'model_dump'):
+            result_dict = result.model_dump()
+        else:
+            result_dict = {
+                k: v for k, v in result.__dict__.items()
+                if not k.startswith('_')
+            }
+
+        # Remove known non-serializable objects
+        result_dict.pop('ssl_certificate', None)
+        result_dict.pop('downloaded_files', None)
+
+        return result_dict
+    except Exception as e:
+        print(f"Error serializing result: {e}")
+        return {"error": str(e), "url": getattr(result, 'url', 'unknown')}