fix: usage filter

src/pages/usage/config/index.ts

@@ -1,4 +1,8 @@
 export const groupByOptions = [
+  {
+    value: '',
+    label: 'None'
+  },
   {
     value: 'model',
     label: 'Model'

src/pages/usage/config/types.ts

@@ -56,6 +56,8 @@ export type BreakdownItem = UsageFilterItem & {
   models_called: number;
   api_keys_used: number;
   last_active: string;
+  provider_type: string;
+  provider_name: string;
 };
 
 export interface UsageMeta {