Phase 19: Unified CLI entry point (maxclaw.py)

- Single 'maxclaw' command for all functionality
- Subcommands: chat, server, tui, config, analytics, dashboard, version
- Nested config subcommands: list, add, remove, use, active, test, export, import, search
- Updated README with unified CLI documentation
- Updated Dockerfile to use maxclaw.py
- Added .gitignore for __pycache__

Dockerfile

@@ -33,4 +33,4 @@ ENV MODEL_NAME=gemma2:9b
 ENV OLLAMA_BASE_URL=http://host.docker.internal:11434
 
 # Default command
-CMD ["python", "main.py"]
+CMD ["python", "maxclaw.py"]