Refactor: split services.py into services/ package

ChatService → services/chat.py
DocumentService → services/document.py
TTSService → services/tts.py
services/__init__.py re-exports all three for backward-compatible imports

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/tts.py

@@ -0,0 +1,53 @@
+import asyncio
+import platform
+import subprocess
+import tempfile
+
+from config import AppConfig
+
+
+class TTSService:
+    def __init__(self, config: AppConfig):
+        self._voice = config.tts_voice
+        self._edge_voice = config.tts_edge_voice
+
+    async def speak(self, text: str) -> str | None:
+        """크로스플랫폼 TTS. macOS: say→edge-tts→pyttsx3 / Windows: edge-tts→pyttsx3"""
+        if not text:
+            return None
+
+        if platform.system() == "Darwin":
+            try:
+                tmp = tempfile.NamedTemporaryFile(suffix=".aiff", delete=False)
+                tmp.close()
+                await asyncio.to_thread(
+                    subprocess.run,
+                    ["say", "-v", self._voice, "-o", tmp.name, text],
+                    check=True,
+                    capture_output=True,
+                )
+                return tmp.name
+            except Exception:
+                pass
+
+        try:
+            import edge_tts
+            tmp = tempfile.NamedTemporaryFile(suffix=".mp3", delete=False)
+            tmp.close()
+            await edge_tts.Communicate(text, self._edge_voice).save(tmp.name)
+            return tmp.name
+        except Exception:
+            pass
+
+        try:
+            import pyttsx3
+            tmp = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)
+            tmp.close()
+            def _save():
+                engine = pyttsx3.init()
+                engine.save_to_file(text, tmp.name)
+                engine.runAndWait()
+            await asyncio.to_thread(_save)
+            return tmp.name
+        except Exception:
+            return None