refactor(build): simplify setup.py configuration

- Remove dependency management from setup.py
- Remove entry points configuration (moved to pyproject.toml)
- Keep minimal setup.py for backwards compatibility
- Clean up package metadata structure

requirements.txt

@@ -1,3 +1,5 @@
+# Note: These requirements are also specified in pyproject.toml
+# This file is kept for development environment setup and compatibility
 aiosqlite~=0.20
 lxml~=5.3
 litellm>=1.53.1