feat(core): add optionalModels field in AiPrompt and support the front-end modelId param (#12224)

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 -->

packages/backend/server/src/plugins/copilot/providers/anthropic.ts

@@ -34,7 +34,10 @@ export class AnthropicProvider
 {
   override readonly type = CopilotProviderType.Anthropic;
   override readonly capabilities = [CopilotCapability.TextToText];
-  override readonly models = ['claude-3-7-sonnet-20250219'];
+  override readonly models = [
+    'claude-3-7-sonnet-20250219',
+    'claude-3-5-sonnet-20241022',
+  ];
 
   private readonly MAX_STEPS = 20;
 

packages/backend/server/src/plugins/copilot/providers/openai.ts

@@ -74,6 +74,7 @@ export class OpenAIProvider
     'gpt-4.1-2025-04-14',
     'gpt-4.1-mini',
     'o1',
+    'o3',
     'o4-mini',
     // embeddings
     'text-embedding-3-large',

packages/backend/server/src/plugins/copilot/providers/types.ts

@@ -110,12 +110,12 @@ export type CopilotImageOptions = z.infer<typeof CopilotImageOptionsSchema>;
 export interface CopilotTextToTextProvider extends CopilotProvider {
   generateText(
     messages: PromptMessage[],
-    model?: string,
+    model: string,
     options?: CopilotChatOptions
   ): Promise<string>;
   generateTextStream(
     messages: PromptMessage[],
-    model?: string,
+    model: string,
     options?: CopilotChatOptions
   ): AsyncIterable<string>;
 }
@@ -136,7 +136,7 @@ export interface CopilotTextToImageProvider extends CopilotProvider {
   ): Promise<Array<string>>;
   generateImagesStream(
     messages: PromptMessage[],
-    model?: string,
+    model: string,
     options?: CopilotImageOptions
   ): AsyncIterable<string>;
 }
@@ -145,12 +145,12 @@ export interface CopilotImageToTextProvider extends CopilotProvider {
   generateText(
     messages: PromptMessage[],
     model: string,
-    options?: CopilotChatOptions
+    options: CopilotChatOptions
   ): Promise<string>;
   generateTextStream(
     messages: PromptMessage[],
     model: string,
-    options?: CopilotChatOptions
+    options: CopilotChatOptions
   ): AsyncIterable<string>;
 }
 
@@ -162,7 +162,7 @@ export interface CopilotImageToImageProvider extends CopilotProvider {
   ): Promise<Array<string>>;
   generateImagesStream(
     messages: PromptMessage[],
-    model?: string,
+    model: string,
     options?: CopilotImageOptions
   ): AsyncIterable<string>;
 }