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/mt.js

@@ -0,0 +1,67 @@
+//! moment.js locale configuration
+//! locale : Maltese (Malta) [mt]
+//! author : Alessandro Maruccia : https://github.com/alesma
+
+;(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 mt = moment.defineLocale('mt', {
+        months: 'Jannar_Frar_Marzu_April_Mejju_Ġunju_Lulju_Awwissu_Settembru_Ottubru_Novembru_Diċembru'.split(
+            '_'
+        ),
+        monthsShort: 'Jan_Fra_Mar_Apr_Mej_Ġun_Lul_Aww_Set_Ott_Nov_Diċ'.split('_'),
+        weekdays:
+            'Il-Ħadd_It-Tnejn_It-Tlieta_L-Erbgħa_Il-Ħamis_Il-Ġimgħa_Is-Sibt'.split(
+                '_'
+            ),
+        weekdaysShort: 'Ħad_Tne_Tli_Erb_Ħam_Ġim_Sib'.split('_'),
+        weekdaysMin: 'Ħa_Tn_Tl_Er_Ħa_Ġi_Si'.split('_'),
+        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: '[Illum fil-]LT',
+            nextDay: '[Għada fil-]LT',
+            nextWeek: 'dddd [fil-]LT',
+            lastDay: '[Il-bieraħ fil-]LT',
+            lastWeek: 'dddd [li għadda] [fil-]LT',
+            sameElse: 'L',
+        },
+        relativeTime: {
+            future: 'f’ %s',
+            past: '%s ilu',
+            s: 'ftit sekondi',
+            ss: '%d sekondi',
+            m: 'minuta',
+            mm: '%d minuti',
+            h: 'siegħa',
+            hh: '%d siegħat',
+            d: 'ġurnata',
+            dd: '%d ġranet',
+            M: 'xahar',
+            MM: '%d xhur',
+            y: 'sena',
+            yy: '%d sni',
+        },
+        dayOfMonthOrdinalParse: /\d{1,2}º/,
+        ordinal: '%dº',
+        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 mt;
+
+})));