AI:n drivs av plattformen — flytta Claude-anropet till backend

- Ny edge-funktion supabase/functions/felsokning-ai: äger Claude
  API-nyckeln (serverhemligheten ANTHROPIC_API_KEY), systemprompten,
  modellvalet (claude-opus-5) och svarsschemat. Kräver inloggad
  användare (verify_jwt = true), validerar promptlängd och hanterar
  refusal/fallback på serversidan.
- Klienten anropar plattformens endpoint via functions.invoke —
  @anthropic-ai/sdk borttagen ur klientberoendena, ingen nyckel
  hanteras eller lagras någonsin i webbläsaren.
- Nyckelpanelen på startsidan ersatt med statuspanel: AI-handledning
  ingår i tjänsten; i lokalt läge (ej inloggad) guidar den
  deterministiska metodiken ensam, utan felbrus.
- Master Prompt: onboarding utan API-nyckelsteg; nytt stycke om att
  AI:n drivs av plattformen och att AI-reglerna inte kan kringgås
  från klientsidan.
- Test låser att endpointen äger systemprompt, modell och schema.

Verifierat: 25 vitest-tester gröna, produktionsbygge ok, båda
Playwright-sviterna gröna.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012EQg3rJsrQ1ZNTvkzmQAtt

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