feat(backend): storage lists the heaviest chats, summary and file list take a chat filter

backend/src/utils/read/models.py

@@ -253,6 +253,13 @@ class StorageSummaryView(BaseModel):
     groups: list[StorageGroupView]
 
 
+class StorageChatView(BaseModel):
+    chat_id: int
+    files: int
+    bytes: int
+    groups: list[StorageGroupView]
+
+
 class StorageFileView(BaseModel):
     media_id: int
     chat_id: int