feat: Supprimer le fallback et forcer WebAuthn

- Supprimer toutes les vérifications de contexte et fallback
- Forcer l'appel direct à navigator.credentials.create()
- Simplifier le code pour identifier le problème WebAuthn
- Tester si WebAuthn fonctionne sans conditions

src/services/secure-credentials.service.ts

@@ -104,73 +104,39 @@ export class SecureCredentialsService {
       const encryptedSpendKey = await this.encryptKey(credentialData.spendKey, masterKey);
       const encryptedScanKey = await this.encryptKey(credentialData.scanKey, masterKey);
 
-      // Vérifier si WebAuthn est disponible et si on est en HTTPS
-      const isSecureContext = window.isSecureContext;
-      const hasWebAuthn = navigator.credentials && navigator.credentials.create;
-
-      secureLogger.info('WebAuthn availability check', {
+      // Forcer l'utilisation de WebAuthn (pas de fallback)
+      console.log('🔍 DEBUG: Forcing WebAuthn credential creation');
+      secureLogger.info('Forcing WebAuthn credential creation', {
         component: 'SecureCredentialsService',
-        operation: 'webauthn_check',
-        isSecureContext,
-        hasWebAuthn,
-        userAgent: navigator.userAgent,
-        protocol: window.location.protocol
+        operation: 'webauthn_force'
       });
       
-      let credential = null;
-
-      if (isSecureContext && hasWebAuthn) {
-        // Stocker dans les credentials du navigateur (HTTPS requis)
-        try {
-          console.log('🔍 DEBUG: WebAuthn branch taken - attempting credential creation');
-          secureLogger.info('Attempting to create WebAuthn credential', {
-            component: 'SecureCredentialsService',
-            operation: 'webauthn_create_attempt'
-          });
-
-          credential = await navigator.credentials.create({
-            publicKey: {
-              challenge: new Uint8Array(32),
-              rp: { name: '4NK Secure Storage' },
-              user: {
-                id: new TextEncoder().encode('4nk-user'),
-                name: '4NK User',
-                displayName: '4NK User'
-              },
-              pubKeyCredParams: [
-                { type: 'public-key', alg: -7 }, // ES256
-                { type: 'public-key', alg: -257 } // RS256
-              ],
-              authenticatorSelection: {
-                authenticatorAttachment: 'platform',
-                userVerification: 'required'
-              },
-              timeout: 60000,
-              attestation: 'direct'
-            }
-          });
-
-          secureLogger.info('WebAuthn credential created successfully', {
-            component: 'SecureCredentialsService',
-            operation: 'webauthn_create'
-          });
-        } catch (error) {
-          secureLogger.warn('WebAuthn credential creation failed, using fallback', error as Error, {
-            component: 'SecureCredentialsService',
-            operation: 'webauthn_create'
-          });
+      const credential = await navigator.credentials.create({
+        publicKey: {
+          challenge: new Uint8Array(32),
+          rp: { name: '4NK Secure Storage' },
+          user: {
+            id: new TextEncoder().encode('4nk-user'),
+            name: '4NK User',
+            displayName: '4NK User'
+          },
+          pubKeyCredParams: [
+            { type: 'public-key', alg: -7 }, // ES256
+            { type: 'public-key', alg: -257 } // RS256
+          ],
+          authenticatorSelection: {
+            authenticatorAttachment: 'platform',
+            userVerification: 'required'
+          },
+          timeout: 60000,
+          attestation: 'direct'
         }
-      } else {
-        console.log('🔍 DEBUG: WebAuthn fallback branch taken');
-        console.log('🔍 DEBUG: isSecureContext:', isSecureContext);
-        console.log('🔍 DEBUG: hasWebAuthn:', hasWebAuthn);
-        secureLogger.info('WebAuthn not available (HTTP context), using fallback storage', {
-          component: 'SecureCredentialsService',
-          operation: 'webauthn_fallback',
-          isSecureContext,
-          hasWebAuthn
-        });
-      }
+      });
+      
+      secureLogger.info('WebAuthn credential created successfully', {
+        component: 'SecureCredentialsService',
+        operation: 'webauthn_create'
+      });
 
       if (credential) {
         // Stocker les données chiffrées dans IndexedDB