feat(plugins): add hosted web search client

shared/data-service.ts

@@ -100,6 +100,11 @@ export type CapabilityBillingReceiptV1 =
       actual_points: string;
       usage_amount?: number;
       unit?: string;
+    }
+  | {
+      /** Main-only projection used when a possibly-dispatched receipt cannot be read. */
+      mode: 'platform_metered';
+      status: 'receipt_unavailable';
     };
 
 export interface CapabilityResultV1<T = unknown> {