feat(tenancy): add profile editing in merchant team edit modal

Edit modal now has editable first_name, last_name, email fields with
a "Save Profile" button, alongside the existing per-store role management.

New:
- PUT /merchants/account/team/members/{user_id}/profile endpoint
- MerchantTeamProfileUpdate schema
- update_team_member_profile() service method with ownership validation
- 2 new i18n keys across 4 locales (personal_info, save_profile)

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

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

@@ -201,6 +201,31 @@ function merchantTeam() {
             this.showEditModal = true;
         },
 
+        /**
+         * Update member profile (first name, last name, email)
+         */
+        async updateMemberProfile(userId, firstName, lastName, email) {
+            this.saving = true;
+            try {
+                await apiClient.put(
+                    `/merchants/account/team/members/${userId}/profile`,
+                    { first_name: firstName, last_name: lastName, email: email }
+                );
+
+                Utils.showToast(I18n.t('tenancy.messages.team_member_updated'), 'success');
+                merchantTeamLog.info('Updated member profile:', userId);
+
+                this.showEditModal = false;
+                this.selectedMember = null;
+                await this.loadTeamData();
+            } catch (error) {
+                merchantTeamLog.error('Failed to update member profile:', error);
+                Utils.showToast(error.message || 'Failed to update member profile', 'error');
+            } finally {
+                this.saving = false;
+            }
+        },
+
         /**
          * Update member role for a specific store
          */