feat(core): default User Management to current account context

- Updated load_ae_obj_li__user to support for_obj_id filtering.
- Updated create_ae_obj__user to support account_id for new users.
- Updated User Management page to default to current account_id for listing and creation.

src/routes/core/users/+page.svelte

@@ -14,6 +14,7 @@
         loading = true;
         user_li = await load_ae_obj_li__user({
             api_cfg: $ae_api,
+            for_obj_id: $ae_loc.account_id,
             qry_str: qry_str || null,
             enabled: qry_enabled as any,
             log_lvl: 1
@@ -36,6 +37,7 @@
         
         await create_ae_obj__user({
             api_cfg: $ae_api,
+            account_id: $ae_loc.account_id,
             data_kv: { username, email, enable: true },
             log_lvl: 1
         });