Fix creative chat message typing for streaming API

[esclipse]

Motivation

• Resolve a TypeScript compile error caused by chat messages lacking explicit user/assistant typing in the creative chat streaming flow.
• Ensure the OpenAI client streaming code has properly typed messages so the app can build and stream assistant output reliably.
• Preserve and align recent changes: proxying stock analysis to the hosted /analyze endpoint, front-end streaming UX, and improved diagnostics.
• Improve error handling and logging for AI-related endpoints to provide clearer failure details.

Description

• Cast sanitized messages to { role: 'user' | 'assistant', content: string } in app/api/creative-chat/route.ts to satisfy the OpenAI SDK types.
• Refactor creative-chat to create an OpenAI client explicitly, stream chat completions, and return an SSE text/event-stream Response with improved logging and error mapping.
• Update app/api/stock-analysis/route.ts to proxy to the hosted /analyze path, accept scoring, score, aiPrompt, and settings, and optionally call the AI to generate analysis when aiPrompt is present.
• Align front-end pages by updating app/stock/page.tsx to send symbol lists and score booleans, update app/translate/page.tsx to consume streaming creative-chat responses and show a live assistant placeholder, remove the local python_service and the next.config.js rewrite, and update .env.local/README.md to the hosted PYTHON_SERVICE_URL.

Testing

• The TypeScript build was run and initially failed due to the chat message typing error, which this change addresses.
• After applying the typing fix, no automated CI/build was re-run in this rollout.
• No unit or integration tests were executed as part of this change.

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Project	Deployment	Review	Updated (UTC)
mcp-test	Ready	Preview, Comment	Dec 31, 2025 9:39am

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