* refactor: remove tokenizer-related functionality and dependencies
- Removed tokenizer dependencies from package.json.
- Deleted TokensCounter component and its usages across the application.
- Updated model configurations to exclude tokenizer properties.
- Refactored model processing logic to support only OpenAI-compatible endpoints.
- Adjusted API responses to omit tokenizer information.
- Cleaned up related utility functions and imports.
* Remove web search functionality and related components
- Deleted endpoints for various web search APIs (serpApi, serpStack, serper, webLocal, youApi).
- Removed generateQuery function and its usage in search.
- Eliminated web search related types and interfaces from the codebase.
- Updated Assistant and Conversation types to remove references to web search and embedding models.
- Cleaned up related utility functions and message updates for web search.
- Adjusted API routes and components to reflect the removal of web search features.
- Updated…
