feat(auth): add JWT OIDC validation - #84
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Summary
Ajoute le mode OIDC resource server : validation JWT cryptographique par JWKS rotatif, contrôle strict des claims enregistrés et projection minimale vers Principal.
Context
Cette PR est empilée sur #83. Le proxy valide des access tokens émis par un IdP ; il n’implémente ni émission de token, ni authorization code flow, ni enregistrement dynamique.
Approach
Dependencies
Ajoute github.com/golang-jwt/jwt/v5 v5.3.1 pour le parsing et la validation JWT, et github.com/MicahParks/keyfunc/v3 v3.6.2 pour le stockage et la rotation JWKS. Réimplémenter correctement la vérification multi-algorithmes, la sélection kid et le rafraîchissement concurrent avec la bibliothèque standard augmenterait fortement le risque cryptographique. Ces versions conservent le support Go 1.22 du projet.
Test plan
Stability impact
Ajoute le mode auth.mode=oidc et les clés auth.oidc.*. Les modes none et static_bearer existants sont inchangés.
Notes for reviewer
La configuration utilise un jwks_uri explicite. La découverte OIDC automatique est volontairement hors périmètre pour garder la source de clés déterministe.