feat(tenancy): add member detail modal + fix invite name saving

Merchant team page:
- Consistent member display (full_name + email on every row)
- New view button (eye icon) on all members including owner
- View modal shows account info (username, role, email verified,
  last login, account created) and store memberships with roles
- API enriched with user metadata (username, role, is_email_verified,
  last_login, created_at)

Invite fix (both merchant and store routes):
- first_name and last_name from invite form were never passed to the
  service that creates the User account. Now passed through correctly.

i18n: 6 new keys across 4 locales (view_member, account_information,
username, email_verified, last_login, account_created).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/tenancy/static/merchant/js/merchant-team.js

@@ -35,6 +35,7 @@ function merchantTeam() {
         showInviteModal: false,
         showEditModal: false,
         showRemoveModal: false,
+        showViewModal: false,
         selectedMember: null,
 
         // Invite form
@@ -184,6 +185,14 @@ function merchantTeam() {
             }
         },
 
+        /**
+         * Open view modal for a member (read-only detail)
+         */
+        openViewModal(member) {
+            this.selectedMember = JSON.parse(JSON.stringify(member));
+            this.showViewModal = true;
+        },
+
         /**
          * Open edit modal for a member
          */