feat: add adapter usage tracking and retrieval methods across various adapters

domain/adapters/providers/base.py

@@ -21,3 +21,8 @@ class BaseAdapter(Protocol):
     async def stream_file(self, root: str, rel: str, range_header: str | None): ...
     async def stat_file(self, root: str, rel: str): ...
     def get_effective_root(self, sub_path: str | None) -> str: ...
+
+
+@runtime_checkable
+class UsageCapableAdapter(Protocol):
+    async def get_usage(self, root: str) -> Dict: ...