Gabriel Radureau b27d8168eb ✨ feat(auth): OIDC HTTP handlers /start + /callback (ADR-0028 Phase B.4) ...

Two endpoints implementing the OIDC Authorization Code with PKCE flow:
- GET /api/v1/auth/oidc/{provider}/start — generates state + PKCE
  verifier, redirects to provider's authorization_endpoint
- GET /api/v1/auth/oidc/{provider}/callback — validates state,
  exchanges code, validates id_token, signs up on first-use, issues JWT

Wires into pkg/server/server.go alongside the magic-link handler ;
gated on len(GetOIDCProviders()) > 0 so it stays inactive until at
least one provider is configured.

pkg/auth/oidc.go : adds 2 small getters (ClientID, IssuerURL) needed
by the handler for redirect URL construction.

Authoring : Mostly Mistral Vibe (batch7, $4.60 / 45 steps — Q-045 hit
the price cap before merge). Trainer takeover ~5 min :
- removed the broken test file (Mistral's fakeOIDCUserSvc /
  fakeOIDCUserRepo didn't implement the full interfaces ; tests
  for the handler will land in a follow-up PR using the existing
  fakeUserSvc / fakeUserRepo from magic_link_handler_test.go)
- verified build + vet + go test ./pkg/user/api/... green

Phase B.5 (BDD scenarios with mock provider) and the missing
oidc_handler_test.go remain TODO. Brief ready :
~/Work/Vibe/workspaces/PHASE-B-5-READY-TO-LAUNCH.md

2026-05-05 22:29:14 +02:00

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