fix: update TestQueryCache tests to await async cache methods

_QueryCache.get/put/invalidate_all are async (use asyncio.Lock internally).
Updated 6 sync test methods to async def with proper await calls so they
test the actual async interface rather than calling unawaited coroutines.

uv.lock

@@ -1729,7 +1729,7 @@ wheels = [
 
 [[package]]
 name = "unraid-mcp"
-version = "0.2.1"
+version = "0.3.0"
 source = { editable = "." }
 dependencies = [
     { name = "fastapi" },