feat: Add dashboard API endpoints and service for sound statistics

app/repositories/sound.py

@@ -178,3 +178,49 @@ class SoundRepository(BaseRepository[Sound]):
                 search_query, sound_types, sort_by, sort_order
             )
             raise
+
+    async def get_soundboard_statistics(self) -> dict[str, int | float]:
+        """Get statistics for SDB type sounds."""
+        try:
+            statement = select(
+                func.count(Sound.id).label("count"),
+                func.sum(Sound.play_count).label("total_plays"),
+                func.sum(Sound.duration).label("total_duration"),
+                func.sum(Sound.size + func.coalesce(Sound.normalized_size, 0)).label("total_size")
+            ).where(Sound.type == "SDB")
+            
+            result = await self.session.exec(statement)
+            row = result.first()
+            
+            return {
+                "count": row.count if row.count is not None else 0,
+                "total_plays": row.total_plays if row.total_plays is not None else 0,
+                "total_duration": row.total_duration if row.total_duration is not None else 0,
+                "total_size": row.total_size if row.total_size is not None else 0
+            }
+        except Exception:
+            logger.exception("Failed to get soundboard statistics")
+            raise
+
+    async def get_track_statistics(self) -> dict[str, int | float]:
+        """Get statistics for EXT type sounds."""
+        try:
+            statement = select(
+                func.count(Sound.id).label("count"),
+                func.sum(Sound.play_count).label("total_plays"),
+                func.sum(Sound.duration).label("total_duration"),
+                func.sum(Sound.size + func.coalesce(Sound.normalized_size, 0)).label("total_size")
+            ).where(Sound.type == "EXT")
+            
+            result = await self.session.exec(statement)
+            row = result.first()
+            
+            return {
+                "count": row.count if row.count is not None else 0,
+                "total_plays": row.total_plays if row.total_plays is not None else 0,
+                "total_duration": row.total_duration if row.total_duration is not None else 0,
+                "total_size": row.total_size if row.total_size is not None else 0
+            }
+        except Exception:
+            logger.exception("Failed to get track statistics")
+            raise