feat: add Qiniu provider support

[JackChiang233]

Summary

Added support for Qiniu AI (七牛云) as a new model provider. This integration allows users to utilize Qiniu's LLM infrastructure within the framework.

Changes Made

• config.py - Added Qiniu API Key and Base configurations and mapped them to environment variables, enabling the system to configure and use Qiniu MaaS services.

• bridge\agent_bridge.py`bridge\bridge.py` - Added an exact matching rule for Qiniu's default model to ensure that requests for this model are directly routed to the Qiniu provider.

• channel\web\web_channel.py - Integrate Qiniu Cloud into the unified provider configuration system, making it visible, configurable, and savable in the web configuration page.

• common\const.py - Add new Qiniu-related constants and register a default model as a globally unified identifier to support Qiniu provider access and routing.

• models\bot_factory.py - Register the Qiniu branch in the Bot factory to ensure that the QINIU type can be correctly instantiated as a Qiniu Bot implementation.

• models\qiniu\qiniu_bot.py \ models\qiniu\qiniu_session.py - Implement Qiniu dialogue invocation and session management (API requests + context trimming) to improve the actual operational capabilities of the Qiniu provider.

• plugins\cow_cli\cow_cli.py - Added Qiniu model recognition logic to the CLI, enabling automatic matching of the Qiniu provider when the default Qiniu model is selected.

• plugins\godcmd\godcmd.py - const.QINIU has been added to the whitelist of models set to #resetall.

Testing

python -m unittest tests.test_qiniu_provider -v		#OK