Final cleanup: Merge LLM, add Dockerfile

- Merge llm.py + llm_sync.py into single unified client
- Remove llm_sync.py (now just llm.py with both sync/async)
- Add requests to dependencies
- Add Dockerfile for containerized deployment
- Add .dockerignore

All issues resolved!

.dockerignore

@@ -0,0 +1,40 @@
+# Git
+.git
+.gitignore
+
+# Python
+__pycache__
+*.py[cod]
+*$py.class
+*.so
+.Python
+venv/
+.venv/
+env/
+.env
+*.egg-info/
+dist/
+build/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Docs
+*.md
+!README.md
+
+# Local
+*.log
+*.tmp