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/shared/constants/ttsProviders.js

@@ -4,10 +4,10 @@
  */
 export const TTS_PROVIDER_CONFIG = {
   "google-tts": {
-    hasLanguageDropdown: true,
+    hasLanguageDropdown: false,
     hasModelSelector: false,
-    hasBrowseButton: false,
-    voiceSource: "hardcoded", // from providerModels
+    hasBrowseButton: true,
+    voiceSource: "hardcoded", // languages built from providerModels at runtime
   },
   "openai": {
     hasLanguageDropdown: false,