docs(tutorial): DSA summer-school notebook + Colab notebook links

[PatrickCmd]

Summary

Adds hands-on learning material for testing Sunbird AI models via notebooks or the API, aimed at the DSA summer school.

• New interactive notebook — sunbird_ai_apis.ipynb (repo root): a fully documented, interactive tour of every major endpoint.
• Tutorial page — new Interactive Notebooks subsection under Resources linking five Colab notebooks so users can test models via notebooks or the API.

Notebook (sunbird_ai_apis.ipynb)

• Setup section: dependency install, documented token step, and a shared get_headers() / BASE_URL / LANGUAGES config reused throughout.
• Each API section (Translation 🌍, STT 🎙️, TTS 🔊) pairs a plain HTTP call with an ipywidgets panel (dropdowns, file upload, text areas, run buttons).
• Chat Completions 💬 demonstrates both sunflower-14b and sunflower-9b:
  • Model comparison table + SALT model-page links
  • chat() helper and a compare_models() side-by-side helper
  • Interactive chat widget (model dropdown + temperature slider + prompt)
  • Multi-turn, OpenAI SDK, and streaming examples
• Uses the current model names — Sunbird/Sunflower-14B is no longer accepted (appears only in a deprecation callout).

Tutorial page (frontend/src/pages/Tutorial.tsx)

Adds an Interactive Notebooks card grid (matching existing resource-card styling) linking:

1. Sunbird AI APIs — Hands-on (Interactive)
2. Sunbird AI APIs — Non-Interactive
3. Sunflower-Qwen3.5-9B Inference
4. Sunflower Gemma 4 E2B — Text & Speech
5. ASR for 51 African Languages

All links open in a new tab. React SPA rebuilt (app/static/react_build/).

Testing

• Notebook: JSON + Python AST validation (50 unique cells, 0 syntax errors).
• Frontend: npm run build (tsc typecheck + vite build) passes. npm run lint has a pre-existing ESLint flat-config failure unrelated to this change.

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