api-relay DB migration, auth, service-login-verify PersistentNonceCache, UserWallet crypto settings
**Motivations:**
- Migrer api-relay vers base de données SQLite (production)
- Ajouter authentification API key pour endpoints POST (protection abus)
- PersistentNonceCache pour service-login-verify (IndexedDB/localStorage)
- Écran paramètres crypto avancés UserWallet
- Documenter options non implémentées (Merkle, évolutions api-relay)
**Root causes:**
- N/A (évolutions + correctifs)
**Correctifs:**
- N/A
**Evolutions:**
- api-relay: DatabaseStorageService (SQLite), StorageAdapter (compatibilité), ApiKeyService (génération/validation), auth middleware (Bearer/X-API-Key), endpoints admin (/admin/api-keys), migration script (migrate-to-db.ts), suppression saveToDisk périodique
- service-login-verify: PersistentNonceCache (IndexedDB avec fallback localStorage, TTL, cleanup), export dans index
- userwallet: CryptoSettingsScreen (hashAlgorithm, jsonCanonizationStrict, ecdhCurve, nonceTtlMs, timestampWindowMs), modifications LoginScreen, LoginForm, CreateIdentityScreen, ImportIdentityScreen, DataExportImportScreen, PairingDisplayScreen, RelaySettingsScreen, ServiceListScreen, MemberSelectionScreen, GlobalActionBar
- features: OPTIONS_NON_IMPLENTEES.md (analyse Merkle trees, évolutions api-relay)
**Pages affectées:**
- api-relay: package.json, index.ts, middleware/auth.ts, services/database.ts, services/storageAdapter.ts, services/apiKeyService.ts, scripts/migrate-to-db.ts
- service-login-verify: persistentNonceCache.ts, index.ts, tsconfig.json, dist/
- userwallet: App, CryptoSettingsScreen, LoginScreen, LoginForm, CreateIdentityScreen, ImportIdentityScreen, DataExportImportScreen, PairingDisplayScreen, RelaySettingsScreen, ServiceListScreen, MemberSelectionScreen, GlobalActionBar
- features: OPTIONS_NON_IMPLENTEES.md
- data: sync-utxos.log
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