* feat(wecom): add WebSocket long-connection support for WeCom AI Bot
- Introduced WeComAIBotWSChannel to handle WebSocket connections.
- Updated NewWeComAIBotChannel to prioritize WebSocket mode when BotID and Secret are provided.
- Enhanced WeComAIBotConfig to include BotID and Secret for WebSocket mode.
- Implemented message handling for text, image, voice, and mixed messages in WebSocket mode.
- Added tests for WebSocket mode functionality and ensured backward compatibility with webhook mode.
- Refactored existing code to improve clarity and maintainability.
* feat(wecom): implement periodic processing hints and enforce WeCom stream deadline
* feat(wecom): update WeCom AI Bot setup instructions and configuration parameters
* feat(wecom): enhance WeCom AI Bot with image handling and media support
* feat(wecom): refactor WeCom AI Bot task management to use req_id for concurrent message handling
* feat(wecom): refactor WeCom AI Bot to manage request states and late replies
* feat(wecom): add response timeout handling and improve WebSocket command acknowledgment
* fix(wecom): improve error handling for late reply proactive push delivery
* refactor(wecom): reorganize WeCom AI Bot configuration fields for improved readability
* fix(wecom): update error message for websocket delivery failure in late reply proactive push
* feat(wecom): implement shared HTTP clients for WeCom image handling and response URL posting
* refactor(wecom): simplify image download and storage process in storeWSImage
* fix(wecom): improve error logging for WebSocket message handling and proactive push delivery
* fix(wecom): enhance WebSocket connection stability and task cancellation handling
* fix(wecom): improve WS image message handling by ensuring proper error response and initializing mediaRefs
* feat(wecom): enhance WeCom AIBot WebSocket handling with message deduplication and support for file and video messages
* refactor(wecom): rename image handling functions to media handling and enhance media type support
* feat(wecom): implement byte-aware content splitting for WeCom AI Bot stream messages
* refactor(wecom): remove max message length constraint from WeCom AIBot WS channel