AI017-Personalize chatbot with user profile context

[Liam301020]

Summary

• Routes chatbot requests through the app API so logged-in user profile and preference data can be used before calling the AI backend.
• Adds a chatbot greeting endpoint that can greet the user by saved profile name.
• Injects dietary requirements, allergies/intolerances, preferred cuisines, disliked ingredients, health conditions, spice level, and cooking methods into nutrition-related chatbot prompts.
• Keeps non-nutrition prompts on the existing domain guard/fallback path.
• Adds safety-note prompting for allergy, medical condition, and health-risk related responses.
• Expands the AI chatbot request limit so profile-enriched prompts are accepted.

Testing

• node --check services/chatbotService.js
• node --check controller/chatbotController.js
• node --check services/index.js
• python -m py_compile nutrihelp_ai/routers/chatbot_api.py
• Manual chatbot checks for nutrition, allergy/gluten, meal recommendation, and non-nutrition fallback prompts.

[TienNguyen3711]

I have checked on my device. It works well. Approved