- Implemented `RefreshTokens` method in client interfaces and Gemini clients.
- Updated handlers to call `RefreshTokens` on 401 responses and retry requests if token refresh succeeds.
- Enhanced error handling and retry logic to accommodate token refresh flow.
- Updated all handlers to safely unlock the request mutex only if it's non-nil.
- Enhanced mutex locking and unlocking logic to avoid runtime errors.
- Improved robustness of resource cleanup across clients.
Add `GetRequestMutex` method for synchronization across clients
- Introduced a new `GetRequestMutex` method in OpenAICompatibilityClient, CodexClient, GeminiCLIClient, GeminiClient, and QwenClient for request synchronization.
- Ensures only one request is processed at a time to manage quotas effectively.
- Introduced OpenAI compatibility configurations for external providers, enabling model alias routing via the OpenAI API format.
- Enhanced provider logic in `GetProviderName` to handle OpenAI aliases and added new helper functions for compatibility checks.
- Updated API handlers and client initialization to support OpenAI compatibility models.
- Improved resource cleanup across clients by closing response bodies and streams using deferred functions.
- Introduced retry counter with a configurable ` RequestRetry ` limit in all handlers.
- Enhanced error handling with specific HTTP status codes for switching clients.
- Standardized response forwarding for non-retriable errors.
- Improved logging for quota and client switch scenarios.
- Simplified variable initialization in `browser.go` for readability.
- Updated error handling in `request_logger.go` with better resource cleanup using deferred anonymous functions.
Refactor API handlers to use `GetContextWithCancel` for streamlined context creation and response handling
- Replaced redundant `context.WithCancel` and `context.WithValue` logic with the new `GetContextWithCancel` utility in all handlers.
- Centralized API response storage in the given context during cancellation.
- Updated associated cancellation calls for consistency and improved resource management.
- Replaced `apiResponseData` with `AddAPIResponseData` for centralized response recording.
- Simplified cancellation logic by switching to a boolean-based `cliCancel` method.
- Removed unused `apiResponseData` slices across handlers to reduce memory usage.
- Updated `handlers.go` to support unified response data storage per request context.
