Close [AI-86](https://linear.app/affine-design/issue/AI-86)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Improved chat session forking to allow creating a fork without specifying the latest message, enabling more flexible session management.
- **Bug Fixes**
- Forking a chat session with an invalid latest message ID now correctly returns an error.
- **Tests**
- Added and updated test cases to cover session forking with missing or invalid latest message IDs, ensuring robust behavior in these scenarios.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
fix AI-14
fix AI-17
fix AI-39
fix AI-112
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Expanded and reorganized prompt options for text and image actions, adding new prompts for image generation, style conversions, upscaling, background removal, and sticker creation.
- Enhanced image editing capabilities with direct support for image attachments in prompts.
- **Improvements**
- Updated prompt names and descriptions to be more user-friendly and descriptive.
- Simplified and clarified prompt selection and image processing workflows with improved default behaviors.
- Better organization of prompts through clear grouping and categorization.
- **Bug Fixes**
- Improved validation and handling of image attachments during editing requests.
- **Refactor**
- Internal code restructuring of prompts and provider logic for clarity and maintainability without affecting user workflows.
- Refined message handling and content merging logic to ensure consistent prompt processing.
- Adjusted image attachment rendering logic for improved display consistency.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
fix AI-4
fix AI-18
better provider/model choose to allow fallback to similar models (e.g., self-hosted) when the provider is not fully configured
split functions of different output types
Close [AI-116](https://linear.app/affine-design/issue/AI-116)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Added the ability to retrieve detailed information for a specific Copilot session by its ID, including model metadata and optional models, via the user interface and API.
- Session data now includes additional fields such as the model used and a list of optional models.
- Enhanced GraphQL queries and UI components to support fetching and displaying these new session details.
- **Improvements**
- Session lists now provide richer information, including model details, for each session.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Close [AI-116](https://linear.app/affine-design/issue/AI-116)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Added support for specifying alternative AI models in chat prompts, enabling users to select from multiple available models.
- Expanded AI model options with new additions: 'gpt-4.1', 'o3', and 'claude-3-5-sonnet-20241022'.
- **Enhancements**
- Users can now optionally choose a specific AI model during chat interactions.
- Prompts and chat sessions reflect and support selection of alternative models where applicable.
- **Bug Fixes**
- Improved handling of prompt configuration defaults for better reliability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Fix issue [BS-2522](https://linear.app/affine-design/issue/BS-2522).
### Why make this change?
If the user data contains illegal content, carrying the user data in the system prompt will run the risk of having the account banned.
### What Changed?
- Move the `Context Documents` to the user prompt.
- Add `withPrompt` in `QueryChatHistoriesInput` options.
- Get chat histories without prompt messages.
- Omit document context when saving messages to the `aiSessionMessage` db.
akumatus