feat: add targets field to Policy type for policy assignment tracking

Add optional targets array to Policy type containing type and id fields to support tracking policy assignments to users and groups.

admin-web/src/api/client.ts

@@ -53,6 +53,10 @@ export type Policy = {
   full_tunnel: boolean;
   is_active: boolean;
   destinations?: string[];
+  targets?: Array<{
+    type: string;
+    id: string;
+  }>;
 };
 
 export type Gateway = {