Add SVG assets for login devices and passkey icons

- Created a new SVG file for login devices with detailed paths and styles.
- Added a new SVG file for the passkey icon with multiple vector paths and fill attributes.

.env.example

@@ -11,6 +11,11 @@ DATABASE_URL=postgresql://transit_admin:your_secure_password_here@localhost:5432
 REDIS_URL=redis://localhost:6379
 JWT_SECRET=replace_with_a_long_random_string
 
+# Passkeys (WebAuthn). HTTP works only on localhost; production requires HTTPS.
+WEBAUTHN_RP_NAME=RideBus DE
+WEBAUTHN_RP_ID=localhost
+WEBAUTHN_ORIGIN=http://localhost,http://localhost:3001
+
 # Firebase Cloud Messaging (server-side alert notifications)
 # Keep disabled to run without Firebase credentials.
 FCM_ENABLED=false
@@ -38,3 +43,5 @@ API_URL=/api/v1
 # NODE_ENV=production
 # CORS_ORIGIN=https://admin.yourdomain.com
 # API_URL=/api/v1
+# WEBAUTHN_RP_ID=admin.yourdomain.com
+# WEBAUTHN_ORIGIN=https://admin.yourdomain.com