refactor: remove module system integration from admin and CLI

Removes all module-related logic from the admin dashboard, CLI database
initialization, and AdminPages component:

- Drop `initModules` call from `db init` CLI command and simplify the
  completion message to only reflect core feature tables
- Remove `getModuleDashboardStats` and module page routing from admin
  stats actions and update usage documentation accordingly
- Simplify `AdminPagesClient` to remove module page loading, lazy
  components, and module-specific props (`moduleStats`, `modulePageInfo`,
  `routeInfo`, `enabledModules`)

src/features/admin/components/pages/UserEditPage.js

@@ -9,20 +9,17 @@ import { useToast } from '@zen/core/toast';
  * User Edit Page Component
  * Page for editing an existing user (admin only)
  */
-const UserEditPage = ({ userId, user, enabledModules = {} }) => {
+const UserEditPage = ({ userId, user }) => {
     const router = useRouter();
     const toast = useToast();
-    const clientsModuleActive = Boolean(enabledModules?.clients);
 
     const [userData, setUserData] = useState(null);
     const [loading, setLoading] = useState(true);
     const [saving, setSaving] = useState(false);
-    const [clients, setClients] = useState([]);
     const [formData, setFormData] = useState({
         name: '',
         role: 'user',
         email_verified: 'false',
-        client_id: ''
     });
     const [errors, setErrors] = useState({});
 
@@ -40,15 +37,6 @@ const UserEditPage = ({ userId, user, enabledModules = {} }) => {
         loadUser();
     }, [userId]);
 
-    useEffect(() => {
-        if (clientsModuleActive) {
-            fetch('/zen/api/admin/clients?limit=500', { credentials: 'include' })
-                .then(res => res.json())
-                .then(data => data.clients ? setClients(data.clients) : setClients([]))
-                .catch(() => setClients([]));
-        }
-    }, [clientsModuleActive]);
-
     const loadUser = async () => {
         try {
             setLoading(true);
@@ -64,7 +52,6 @@ const UserEditPage = ({ userId, user, enabledModules = {} }) => {
                     name: data.user.name || '',
                     role: data.user.role || 'user',
                     email_verified: data.user.email_verified ? 'true' : 'false',
-                    client_id: data.linkedClient ? String(data.linkedClient.id) : ''
                 }));
             } else {
                 toast.error(data.message || 'Utilisateur introuvable');
@@ -107,7 +94,6 @@ const UserEditPage = ({ userId, user, enabledModules = {} }) => {
                     name: formData.name.trim(),
                     role: formData.role,
                     email_verified: formData.email_verified === 'true',
-                    ...(clientsModuleActive && { client_id: formData.client_id ? parseInt(formData.client_id, 10) : null })
                 })
             });
             const data = await response.json();
@@ -209,21 +195,6 @@ const UserEditPage = ({ userId, user, enabledModules = {} }) => {
                                 onChange={(value) => handleInputChange('email_verified', value)}
                                 options={emailVerifiedOptions}
                             />
-
-                            {clientsModuleActive && (
-                                <Select
-                                    label="Client associé"
-                                    value={formData.client_id}
-                                    onChange={(value) => handleInputChange('client_id', value)}
-                                    options={[
-                                        { value: '', label: 'Aucun' },
-                                        ...clients.map(c => ({
-                                            value: String(c.id),
-                                            label: [c.client_number, c.company_name || [c.first_name, c.last_name].filter(Boolean).join(' ') || c.email].filter(Boolean).join(' – ')
-                                        }))
-                                    ]}
-                                />
-                            )}
                         </div>
                     </div>
                 </Card>