Sort member lists by last name instead of first name

- Updated member-list.vue to sort by last name with new sort options
- Changed default sort to lastname-asc
- Added Last Name and First Name sort options in dropdown
- Updated board/members/index.vue to include name field and sort by last name
- Updated admin/members/index.vue to include name field and sort by last name
- All member lists now consistently sort alphabetically by last name

pages/admin/members/index.vue

@@ -475,6 +475,8 @@ const loadMembers = async () => {
         member_id: member.Id || member.id,
         first_name: member.first_name,
         last_name: member.last_name,
+        // Add name field for sorting (last name, first name format)
+        name: `${member.last_name || ''}, ${member.first_name || ''}`.trim(),
         email: member.email,
         membership_type: member.membership_type || 'Standard',
         status: member.membership_status === 'Active' ? 'active' : 'inactive',
@@ -483,6 +485,21 @@ const loadMembers = async () => {
         phone: member.phone_number || member.phone || ''
       }));
       
+      // Sort by last name, then first name by default
+      members.value.sort((a, b) => {
+        const aLastName = (a.last_name || '').toLowerCase();
+        const bLastName = (b.last_name || '').toLowerCase();
+        const aFirstName = (a.first_name || '').toLowerCase();
+        const bFirstName = (b.first_name || '').toLowerCase();
+        
+        // First compare by last name
+        const lastNameCompare = aLastName.localeCompare(bLastName);
+        if (lastNameCompare !== 0) return lastNameCompare;
+        
+        // If last names are the same, compare by first name
+        return aFirstName.localeCompare(bFirstName);
+      });
+      
       // Calculate stats from real data
       const now = new Date();
       const startOfMonth = new Date(now.getFullYear(), now.getMonth(), 1);