Revert "feat: replace MeloTTS with Coqui XTTS-v2 natural Korean voice"

This reverts commit 39a0944105.

bridge/settings_web.py

@@ -22,7 +22,8 @@ from typing import Any, Dict
 FIELDS = [
     ("ollama_chat_model", "LLM 모델", "model"),
     ("whisper_model", "STT(Whisper) 모델", "select:tiny,base,small,medium,large,large-v3"),
-    ("tts_engine", "TTS 엔진", "select:xtts,piper"),
+    ("tts_engine", "TTS 엔진", "select:melo,piper"),
+    ("melo_speed", "TTS 속도 (MeloTTS)", "number:0.5:2.5:0.1"),
     ("output_language", "출력 언어 (비우면 사용자 언어)", "text"),
     ("llm_thinking_enabled", "LLM 사고(thinking) 모드", "bool"),
     ("agentic_max_turns", "에이전트 최대 반복", "number:1:12:1"),
@@ -53,7 +54,9 @@ def _current() -> Dict[str, Any]:
     cfg = _read_config()
     out: Dict[str, Any] = {}
     for k in _KEYS:
-        if k == "output_language":
+        if k == "melo_speed":
+            out[k] = cfg.get("melo_speed", os.environ.get("MELO_SPEED", "1.5"))
+        elif k == "output_language":
             out[k] = cfg.get("output_language", os.environ.get("OUTPUT_LANGUAGE", ""))
         else:
             out[k] = cfg.get(k, "")
@@ -75,7 +78,12 @@ def _coerce(updates: Dict[str, Any]) -> Dict[str, Any]:
     for k, v in updates.items():
         if k not in _KEYS:
             continue
-        if k == "agentic_max_turns":
+        if k == "melo_speed":
+            try:
+                v = float(v)
+            except (TypeError, ValueError):
+                continue
+        elif k == "agentic_max_turns":
             try:
                 v = int(v)
             except (TypeError, ValueError):
@@ -106,12 +114,12 @@ def _save(updates: Dict[str, Any]) -> None:
 
 
 def _apply() -> str:
-    # Restart the TTS worker + bridge AFTER this response is sent. Detached (new
-    # session) so the bridge being killed mid-restart doesn't drop the restart
-    # itself, and the HTTP client still receives this response.
+    # Restart melo + bridge AFTER this response is sent. Detached (new session)
+    # so the bridge being killed mid-restart doesn't drop the restart itself,
+    # and the HTTP client still receives this response.
     try:
         subprocess.Popen(
-            ["sh", "-c", "sleep 1; supervisorctl restart xtts-worker bridge"],
+            ["sh", "-c", "sleep 1; supervisorctl restart melo-worker bridge"],
             start_new_session=True,
         )
         return "1초 후 브리지/TTS 워커가 재시작되어 반영됩니다."