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/package.json

@@ -26,7 +26,7 @@
   },
   "dependencies": {
     "@ai-sdk/google": "^1.2.10",
-    "@ai-sdk/openai": "^1.3.9",
+    "@ai-sdk/openai": "^1.3.18",
     "@ai-sdk/perplexity": "^1.1.6",
     "@apollo/server": "^4.11.3",
     "@aws-sdk/client-s3": "^3.779.0",