feat: add device token management UI

- Display sync URLs for Kobo devices with copy button
- Display auth tokens for KOReader devices with copy button
- Add regenerate token button with confirmation
- Show warning about token invalidation

internal/router/frontend.go

@@ -168,7 +168,7 @@ func registerFrontendRoutes(cfg *Config) {
 		}
 		pendingList := convertPending(pendingMaps)
 		var buf bytes.Buffer
-		err = templates.Devices(user, devices, pendingList).Render(c.Request().Context(), &buf)
+		err = templates.Devices(user, devices, pendingList, cfg.Cfg.BaseURL).Render(c.Request().Context(), &buf)
 		if err != nil {
 			return err
 		}