fix: ChatTTS检测改用同步requests，解决async问题

requirements.txt

@@ -2,4 +2,5 @@ fastapi==0.110.0
 uvicorn==0.27.1
 python-multipart==0.0.9
 aiohttp==3.9.3
-edge-tts==6.1.9
+edge-tts==6.1.9
+requests==2.31.0

tts_service.py

@@ -145,24 +145,13 @@ class ChatTTSProvider(TTSProvider):
         """检查 ChatTTS 是否可用"""
         if self._available is None:
             try:
-                import aiohttp
-                import asyncio
-                
-                async def check():
-                    try:
-                        async with aiohttp.ClientSession() as session:
-                            async with session.get(
-                                f"{self.CHATTTS_URL}/health",
-                                timeout=aiohttp.ClientTimeout(total=5)
-                            ) as resp:
-                                if resp.status == 200:
-                                    data = await resp.json()
-                                    return data.get("status") == "ok"
-                    except:
-                        pass
-                    return False
-                
-                self._available = asyncio.get_event_loop().run_until_complete(check())
+                import requests
+                resp = requests.get(f"{self.CHATTTS_URL}/health", timeout=5)
+                if resp.status_code == 200:
+                    data = resp.json()
+                    self._available = data.get("status") == "ok"
+                else:
+                    self._available = False
             except Exception as e:
                 logger.warning(f"ChatTTS check failed: {e}")
                 self._available = False