chore: execute Sprint 38 technical debt resolution (Type Safety, Zod validation, Vitest, Mock LLM extracted)

feat: Genspark-Standard upgrade, MLOps audit fixes, and XAMLÉ branding

fix(logic): prioritize commands over exercises and strictly lock gateway routing

fix: port alignment, cascade delete, and audio pipeline hardening

feat(prod): implementation of missing features for production readiness

fix(webhook): ADMIN_API_KEY demoted to warning — API starts with only WHATSAPP_VERIFY_TOKEN, Meta validation can reach public /webhook

fix(startup): WHATSAPP_APP_SECRET demoted to warning — API no longer crashes if absent

feat(arch): interactive LIST menu, audio download-media job, OpenAI 429 fallback, DAY action IDs

fix: explicit dns setDefaultResultOrder ipv4first at global level

chore: revert /debug/net to google.com

chore: add /debug/graph endpoint to explicitly test Facebook Graph API accessibility on HF

chore: map debug route to graph.facebook.com to check HF DNS block

feat: add /debug/net route to test HF outbound network

fix: update privacy policy contact email to seydi@safetrack.tech

feat: add /privacy route for Meta app publication requirement

fix(security): audit fixes — Stripe webhook scope, fail-fast secrets, prisma singleton, worker auth, Zod validation, WA number env var

fix(index): use dynamic import for rate-limit to fix local TS module error

fix(auth): inline onRequest hook in guardedRoutes scope to properly protect private routes

fix(api): move all imports to top level to fix ESM error in index.ts

feat(security): API key auth, HMAC webhook verification, rate limiting, Zod validation

feat(api): add root healthcheck for huggingface proxy

fix(whatsapp): ignore trailing slashes globally for meta webhook

feat: implement AI document generation (mock, pdf, pptx) and worker integration

feat: implement dynamic admin dashboard with API data

fix: resolve TS compilation errors in api service

feat: add Dockerfile and script for Hugging Face Spaces

Initial commit: Monorepo setup with React+Vite, Fastify, Prisma, and Docker Compose