Release version 0.13.6

• feat(model-provider): Each provider is now bound to a single agent type and carries its own model selection — five slots for Claude Code, one for Codex and Gemini. Switching providers cascades the URL, key, and model into the agent in one step.
• feat(chat): Refreshed the chat welcome screen with a new halo hero and rotating tips.
• fix(model-provider): Agent type is now locked after creation, and mismatched bindings fail loudly instead of silently mis-parsing the model.

发布版本 0.13.6

• 功能(模型提供商)：每个提供商现在绑定到唯一的智能体类型，并自带模型配置 —— Claude Code 5 个槽位，Codex 和 Gemini 各 1 个。切换提供商时，URL、Key 和模型会一次性级联到对应智能体。
• 功能(聊天)：聊天欢迎页焕新，新增光晕主视觉和随机使用小贴士。
• 修复(模型提供商)：智能体类型创建后不可更改，绑定不匹配会直接报错，不再静默错配模型字段。