This commit represents a significant architectural improvement:
- Completely replaced openwebui_connector with a more robust openwebui_base module
- Centralized OpenWebUI API integration for better maintainability
- Redesigned helpdesk_sale_order_ai to use the new openwebui_base module
- Added support for multiple OpenWebUI providers and models
- Improved error handling and response parsing
- Added proper template management with openwebui_prompt_template
- Fixed KeyError issues with safe template substitution
- Streamlined API client initialization and usage
