Phase 2 stabilisation: code mort, Modal→Dialog, feature flags, tests, router split, Rust legacy
Bloc A - Code mort:
- Suppression Studio (components, views, features)
- Suppression gamification + services mock (projectService, storageService, gamificationService)
- Mise à jour Sidebar, Navbar, locales
Bloc B - Frontend:
- Suppression modal.tsx deprecated, Modal.stories (doublon Dialog)
- Feature flags: PLAYLIST_SEARCH, PLAYLIST_RECOMMENDATIONS, ROLE_MANAGEMENT = true
- Suppression 19 tests orphelins, retrait exclusions vitest.config
Bloc C - Backend:
- Extraction routes_auth.go depuis router.go
Bloc D - Rust:
- Suppression security_legacy.rs (code mort, patterns déjà dans security/)
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