feat: Add status and error fields to TTS model and implement background processing for TTS generations

app/api/v1/tts.py

@@ -33,6 +33,8 @@ class TTSResponse(BaseModel):
     text: str
     provider: str
     options: dict[str, Any]
+    status: str
+    error: str | None
     sound_id: int | None
     user_id: int
     created_at: str
@@ -81,6 +83,8 @@ async def get_tts_list(
                 text=tts.text,
                 provider=tts.provider,
                 options=tts.options,
+                status=tts.status,
+                error=tts.error,
                 sound_id=tts.sound_id,
                 user_id=tts.user_id,
                 created_at=tts.created_at.isoformat(),
@@ -125,6 +129,8 @@ async def generate_tts(
                 text=tts_record.text,
                 provider=tts_record.provider,
                 options=tts_record.options,
+                status=tts_record.status,
+                error=tts_record.error,
                 sound_id=tts_record.sound_id,
                 user_id=tts_record.user_id,
                 created_at=tts_record.created_at.isoformat(),