fix: prevent asset conflicts between React and Grid.js versions

Add coexistence checks to all enqueue methods to prevent loading
both React and Grid.js assets simultaneously.

Changes:
- ReactAdmin.php: Only enqueue React assets when ?react=1
- Init.php: Skip Grid.js when React active on admin pages
- Form.php, Coupon.php, Access.php: Restore classic assets when ?react=0
- Customer.php, Product.php, License.php: Add coexistence checks

Now the toggle between Classic and React versions works correctly.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

node_modules/moment/locale/fr-ch.js

@@ -0,0 +1,85 @@
+//! moment.js locale configuration
+//! locale : French (Switzerland) [fr-ch]
+//! author : Gaspard Bucher : https://github.com/gaspard
+
+;(function (global, factory) {
+   typeof exports === 'object' && typeof module !== 'undefined'
+       && typeof require === 'function' ? factory(require('../moment')) :
+   typeof define === 'function' && define.amd ? define(['../moment'], factory) :
+   factory(global.moment)
+}(this, (function (moment) { 'use strict';
+
+    //! moment.js locale configuration
+
+    var frCh = moment.defineLocale('fr-ch', {
+        months: 'janvier_février_mars_avril_mai_juin_juillet_août_septembre_octobre_novembre_décembre'.split(
+            '_'
+        ),
+        monthsShort:
+            'janv._févr._mars_avr._mai_juin_juil._août_sept._oct._nov._déc.'.split(
+                '_'
+            ),
+        monthsParseExact: true,
+        weekdays: 'dimanche_lundi_mardi_mercredi_jeudi_vendredi_samedi'.split('_'),
+        weekdaysShort: 'dim._lun._mar._mer._jeu._ven._sam.'.split('_'),
+        weekdaysMin: 'di_lu_ma_me_je_ve_sa'.split('_'),
+        weekdaysParseExact: true,
+        longDateFormat: {
+            LT: 'HH:mm',
+            LTS: 'HH:mm:ss',
+            L: 'DD.MM.YYYY',
+            LL: 'D MMMM YYYY',
+            LLL: 'D MMMM YYYY HH:mm',
+            LLLL: 'dddd D MMMM YYYY HH:mm',
+        },
+        calendar: {
+            sameDay: '[Aujourd’hui à] LT',
+            nextDay: '[Demain à] LT',
+            nextWeek: 'dddd [à] LT',
+            lastDay: '[Hier à] LT',
+            lastWeek: 'dddd [dernier à] LT',
+            sameElse: 'L',
+        },
+        relativeTime: {
+            future: 'dans %s',
+            past: 'il y a %s',
+            s: 'quelques secondes',
+            ss: '%d secondes',
+            m: 'une minute',
+            mm: '%d minutes',
+            h: 'une heure',
+            hh: '%d heures',
+            d: 'un jour',
+            dd: '%d jours',
+            M: 'un mois',
+            MM: '%d mois',
+            y: 'un an',
+            yy: '%d ans',
+        },
+        dayOfMonthOrdinalParse: /\d{1,2}(er|e)/,
+        ordinal: function (number, period) {
+            switch (period) {
+                // Words with masculine grammatical gender: mois, trimestre, jour
+                default:
+                case 'M':
+                case 'Q':
+                case 'D':
+                case 'DDD':
+                case 'd':
+                    return number + (number === 1 ? 'er' : 'e');
+
+                // Words with feminine grammatical gender: semaine
+                case 'w':
+                case 'W':
+                    return number + (number === 1 ? 're' : 'e');
+            }
+        },
+        week: {
+            dow: 1, // Monday is the first day of the week.
+            doy: 4, // The week that contains Jan 4th is the first week of the year.
+        },
+    });
+
+    return frCh;
+
+})));