fix: update TemplateResponse calls for Starlette 1.0 compatibility

[ayazhankadessova]

Problem

Every HTML page in Sugar-AI returns a 500 Internal Server Error when installed with current dependencies:

TypeError: unhashable type: 'dict'

This affects the welcome page (/), dashboard (/dashboard), admin panel (/admin), OAuth login (/oauth-login), admin login (/admin-login), and key request (/request-key) pages.

Root Cause

requirements.txt has unpinned fastapi, which now installs Starlette 1.0. Starlette 1.0 changed the TemplateResponse API — the request object is now a required first positional argument instead of being passed inside the context dict:

# Old (Starlette <1.0) — what the codebase currently uses
TemplateResponse("name.html", {"request": request, ...})

# New (Starlette 1.0+) — required signature
TemplateResponse(request, "name.html", context={...})

Steps to Reproduce

1. Clone the repo
2. pip install -r requirements.txt (installs FastAPI 0.135+ with Starlette 1.0)
3. DEV_MODE=1 uvicorn main:app --host 0.0.0.0 --port 8000
4. Visit http://localhost:8000/ → 500 error

Fix

Updated all 9 TemplateResponse calls across 4 route modules to use the Starlette 1.0 API.

Files Changed

• app/routes/web.py — welcome page and dashboard
• app/routes/main.py — root welcome page
• app/routes/admin.py — admin panel
• app/routes/auth.py — OAuth login, admin login, key request pages

Testing

After the fix, all pages load correctly:

• GET / — welcome page renders
• GET /oauth-login — login page renders
• GET /admin-login — admin login renders
• GET /request-key — key request form renders
• All API endpoints (/ask, /ask-llm, /ask-llm-prompted) are unaffected (JSON, no templates)