feat(config): enhance serialization and add deep crawling exports

Improve configuration serialization with better handling of frozensets and slots.
Expand deep crawling module exports and documentation.
Add comprehensive API usage examples in Docker README.

- Add support for frozenset serialization
- Improve error handling in config loading
- Export additional deep crawling components
- Enhance Docker API documentation with detailed examples
- Fix ContentTypeFilter initialization

crawl4ai/__init__.py

@@ -33,10 +33,35 @@ from .async_dispatcher import (
 )
 from .docker_client import Crawl4aiDockerClient
 from .hub import CrawlerHub
-from .deep_crawling import DeepCrawlStrategy
+from .deep_crawling import (
+    DeepCrawlStrategy,
+    BFSDeepCrawlStrategy,
+    FastFilterChain,
+    FastContentTypeFilter,
+    FastDomainFilter,
+    FastURLFilter,
+    FastFilterStats,
+    FastKeywordRelevanceScorer,
+    FastURLScorer,
+    BestFirstCrawlingStrategy,
+    DFSDeepCrawlStrategy,
+    DeepCrawlDecorator,
+)
+
 __all__ = [
     "AsyncWebCrawler",
     "DeepCrawlStrategy",
+    "BFSDeepCrawlStrategy",
+    "BestFirstCrawlingStrategy",
+    "DFSDeepCrawlStrategy",
+    "FastFilterChain",
+    "FastContentTypeFilter",
+    "FastDomainFilter",
+    "FastFilterStats",
+    "FastURLFilter",
+    "FastKeywordRelevanceScorer",
+    "FastURLScorer",
+    "DeepCrawlDecorator",
     "CrawlResult",
     "CrawlerHub",
     "CacheMode",