Fix user creation frontend - replace placeholder alerts with actual API calls

- Replace alert placeholders with proper fetch() calls to /api/users endpoint
- Add proper error handling for user creation and deletion
- Enhanced user list loading with error handling
- Users can now be actually created, deleted, and refreshed properly
- Form resets after successful user creation
- Modal closes automatically after successful creation

This completes the user management functionality that was showing alerts
instead of performing actual database operations.

mbetterclient/web_dashboard/templates/dashboard/users.html

@@ -91,7 +91,13 @@
                 const tbody = document.getElementById('users-table-body');
                 tbody.innerHTML = '';
                 
-                data.forEach(user => {
+                if (data.error) {
+                    tbody.innerHTML = '<tr><td colspan="5" class="text-center text-danger">Error loading users: ' + data.error + '</td></tr>';
+                    return;
+                }
+                
+                const users = data.users || [];
+                users.forEach(user => {
                     const row = document.createElement('tr');
                     row.innerHTML = `
                         <td>${user.username}</td>
@@ -134,8 +140,22 @@
     // Delete user
     function deleteUser(userId) {
         if (confirm('Are you sure you want to delete this user?')) {
-            // In a real implementation, this would delete the user
-            alert(`Delete user ${userId} - This would delete the user from the database`);
+            fetch(`/api/users/${userId}`, {
+                method: 'DELETE'
+            })
+            .then(response => response.json())
+            .then(data => {
+                if (data.success) {
+                    alert('User deleted successfully');
+                    loadUsers();
+                } else {
+                    alert('Failed to delete user: ' + (data.error || 'Unknown error'));
+                }
+            })
+            .catch(error => {
+                console.error('Error deleting user:', error);
+                alert('Error deleting user: ' + error.message);
+            });
         }
     }
     
@@ -157,13 +177,41 @@
             return;
         }
         
-        // In a real implementation, this would create the user
-        alert(`Create user: ${username} (${email}) - This would save the user to the database`);
+        // Create user via API
+        fetch('/api/users', {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json',
+            },
+            body: JSON.stringify({
+                username: username,
+                email: email,
+                password: password,
+                is_admin: isAdmin
+            })
+        })
+        .then(response => response.json())
+        .then(data => {
+            if (data.success) {
+                alert('User created successfully');
+                
+                // Reset form
+                document.getElementById('create-user-form').reset();
                 
-        // Close modal and refresh user list
+                // Close modal
                 const modal = bootstrap.Modal.getInstance(document.getElementById('createUserModal'));
                 modal.hide();
+                
+                // Refresh user list
                 loadUsers();
+            } else {
+                alert('Failed to create user: ' + (data.error || 'Unknown error'));
+            }
+        })
+        .catch(error => {
+            console.error('Error creating user:', error);
+            alert('Error creating user: ' + error.message);
+        });
     });
     
     // Load users when page loads