Enhance TTS functionality and security settings

- Integrated Google TTS languages from a separate module for better maintainability.
- Updated local device voice fetching to support both macOS and Windows, improving cross-platform compatibility.
- Enhanced dashboard route protection by adding dynamic settings for login requirements and tunnel access.
- Introduced UI elements for managing security settings related to API key requirements and dashboard access via tunnel.
- Added default TTS response example in the media provider page for better user guidance.
- Updated constants to reflect changes in TTS provider configurations.

This commit improves the overall user experience and security of the TTS features.

src/app/api/settings/require-login/route.js

@@ -5,7 +5,8 @@ export async function GET() {
   try {
     const settings = await getSettings();
     const requireLogin = settings.requireLogin !== false;
-    return NextResponse.json({ requireLogin });
+    const tunnelDashboardAccess = settings.tunnelDashboardAccess === true;
+    return NextResponse.json({ requireLogin, tunnelDashboardAccess });
   } catch (error) {
     return NextResponse.json({ requireLogin: true }, { status: 200 });
   }