Merge remote-tracking branch 'origin/master' into gitea/feature/end

Resolved conflicts taking origin/master (v0.5.55) as canonical, with local
features re-applied:
- runtime log level (LOG_LEVEL env + dashboard Settings → Logging, applied
  immediately and persisted across restarts)
- free/noAuth provider enable/disable toggle via providerStrategies.enabled
- parallel model testing (Test All Models / Test Selected Keys)

open-sse/handlers/ttsProviders/index.js

@@ -6,6 +6,8 @@ import elevenlabs, { fetchElevenLabsVoices } from "./elevenlabs.js";
 import openai from "./openai.js";
 import openrouter from "./openrouter.js";
 import gemini, { fetchGeminiVoices } from "./gemini.js";
+import xiaomiMimo from "./xiaomi-mimo.js";
+import selfhostedTts from "./selfhostedTts.js";
 import { FORMAT_HANDLERS } from "./genericFormats.js";
 import { parseModelVoice } from "./_base.js";
 
@@ -18,6 +20,8 @@ const SPECIAL_ADAPTERS = {
   openai,
   openrouter,
   gemini,
+  "xiaomi-mimo": xiaomiMimo,
+  "selfhosted-tts": selfhostedTts,
 };
 
 export function getTtsAdapter(provider) {