refactor: Remove deprecated files and clean up codebase

This commit deletes obsolete files related to the Basecamp MCP integration, including:
- `basecamp_client.py`
- `basecamp_oauth.py`
- `composio_client_example.py`
- `composio_integration.py`
- `mcp_integration.py`
- `setup.sh`
- `start_basecamp_mcp.sh`

Additionally, a new file `mcp_server_cli.py` is introduced to streamline the MCP server functionality. The README has been updated to reflect these changes and provide clearer setup instructions.

This cleanup aims to enhance maintainability and focus on the core components of the integration.

oauth_app.py

@@ -204,6 +204,7 @@ def auth_callback():
         oauth_client = get_oauth_client()
         logger.info("Exchanging code for token")
         token_data = oauth_client.exchange_code_for_token(code)
+        logger.info(f"Raw token data from Basecamp exchange: {token_data}")
         
         # Store the token in our secure storage
         access_token = token_data.get('access_token')