feat(server): adapt 4o image (#11956)

fix AI-88

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Added support for the new image generation model "gpt-image-1" in both backend and frontend.
  - Updated available prompt options to include "gpt-image-1" for image creation actions.

- **Improvements**
  - Set a 5-minute timeout for image generation requests to improve reliability.

- **Tests**
  - Expanded test coverage to validate image generation using the new "gpt-image-1" prompt.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/plugins/copilot/prompt/prompts.ts

@@ -288,6 +288,12 @@ const actions: Prompt[] = [
     model: 'dall-e-3',
     messages: [],
   },
+  {
+    name: 'debug:action:gpt-image-1',
+    action: 'image',
+    model: 'gpt-image-1',
+    messages: [],
+  },
   {
     name: 'debug:action:fal-sd15',
     action: 'image',