feat: Add TTS statistics endpoint and service method for comprehensive TTS data

app/api/v1/dashboard.py

@@ -41,6 +41,21 @@ async def get_track_statistics(
         ) from e
 
 
+@router.get("/tts-statistics")
+async def get_tts_statistics(
+    _current_user: Annotated[User, Depends(get_current_user)],
+    dashboard_service: Annotated[DashboardService, Depends(get_dashboard_service)],
+) -> dict[str, Any]:
+    """Get TTS statistics."""
+    try:
+        return await dashboard_service.get_tts_statistics()
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to fetch TTS statistics: {e!s}",
+        ) from e
+
+
 @router.get("/top-sounds")
 async def get_top_sounds(
     _current_user: Annotated[User, Depends(get_current_user)],