refactor(config): enhance serialization and config handling

- Add ignore_default_value option to to_serializable_dict
- Add viewport dict support in BrowserConfig
- Replace FastFilterChain with FilterChain
- Add deprecation warnings for unwanted properties
- Clean up unused imports
- Rename example files for consistency
- Add comprehensive Docker configuration tutorial

BREAKING CHANGE: FastFilterChain has been replaced with FilterChain

docs/examples/docker_python_sdk.py

@@ -0,0 +1,35 @@
+import asyncio
+from crawl4ai.docker_client import Crawl4aiDockerClient
+from crawl4ai import (
+    BrowserConfig,
+    CrawlerRunConfig
+)
+
+async def main():
+    async with Crawl4aiDockerClient(base_url="http://localhost:8000", verbose=True) as client:
+        # If jwt is enabled, authenticate first
+        # await client.authenticate("test@example.com")
+        
+        # Non-streaming crawl
+        results = await client.crawl(
+            ["https://example.com", "https://python.org"],
+            browser_config=BrowserConfig(headless=True),
+            crawler_config=CrawlerRunConfig()
+        )
+        print(f"Non-streaming results: {results}")
+        
+        # Streaming crawl
+        crawler_config = CrawlerRunConfig(stream=True)
+        async for result in await client.crawl(
+            ["https://example.com", "https://python.org"],
+            browser_config=BrowserConfig(headless=True),
+            crawler_config=crawler_config
+        ):
+            print(f"Streamed result: {result}")
+        
+        # Get schema
+        schema = await client.get_schema()
+        print(f"Schema: {schema}")
+
+if __name__ == "__main__":
+    asyncio.run(main())