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.

open-sse/config/providerModels.js

@@ -1,4 +1,5 @@
 import { PROVIDERS } from "./providers.js";
+import { GOOGLE_TTS_LANGUAGES } from "./googleTtsLanguages.js";
 
 // Provider models - Single source of truth
 // Key = alias (cc, cx, gc, qw, if, ag, gh for OAuth; id for API Key)
@@ -371,15 +372,7 @@ export const PROVIDER_MODELS = {
   "local-device": [
     { id: "default", name: "System Default Voice", type: "tts" },
   ],
-  "google-tts": [
-    { id: "en", name: "English", type: "tts" },
-    { id: "vi", name: "Vietnamese", type: "tts" },
-    { id: "zh-CN", name: "Chinese (Simplified)", type: "tts" },
-    { id: "fr", name: "French", type: "tts" },
-    { id: "de", name: "German", type: "tts" },
-    { id: "ja", name: "Japanese", type: "tts" },
-    { id: "ko", name: "Korean", type: "tts" },
-  ],
+  "google-tts": GOOGLE_TTS_LANGUAGES,
   // OpenAI TTS voices (hardcoded — no public API to list them)
   // Used by ttsCore.js when provider = openai
   "openai-tts-voices": [