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/cv.js

@@ -0,0 +1,74 @@
+//! moment.js locale configuration
+//! locale : Chuvash [cv]
+//! author : Anatoly Mironov : https://github.com/mirontoli
+
+;(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 cv = moment.defineLocale('cv', {
+        months: 'кӑрлач_нарӑс_пуш_ака_май_ҫӗртме_утӑ_ҫурла_авӑн_юпа_чӳк_раштав'.split(
+            '_'
+        ),
+        monthsShort: 'кӑр_нар_пуш_ака_май_ҫӗр_утӑ_ҫур_авн_юпа_чӳк_раш'.split('_'),
+        weekdays:
+            'вырсарникун_тунтикун_ытларикун_юнкун_кӗҫнерникун_эрнекун_шӑматкун'.split(
+                '_'
+            ),
+        weekdaysShort: 'выр_тун_ытл_юн_кӗҫ_эрн_шӑм'.split('_'),
+        weekdaysMin: 'вр_тн_ыт_юн_кҫ_эр_шм'.split('_'),
+        longDateFormat: {
+            LT: 'HH:mm',
+            LTS: 'HH:mm:ss',
+            L: 'DD-MM-YYYY',
+            LL: 'YYYY [ҫулхи] MMMM [уйӑхӗн] D[-мӗшӗ]',
+            LLL: 'YYYY [ҫулхи] MMMM [уйӑхӗн] D[-мӗшӗ], HH:mm',
+            LLLL: 'dddd, YYYY [ҫулхи] MMMM [уйӑхӗн] D[-мӗшӗ], HH:mm',
+        },
+        calendar: {
+            sameDay: '[Паян] LT [сехетре]',
+            nextDay: '[Ыран] LT [сехетре]',
+            lastDay: '[Ӗнер] LT [сехетре]',
+            nextWeek: '[Ҫитес] dddd LT [сехетре]',
+            lastWeek: '[Иртнӗ] dddd LT [сехетре]',
+            sameElse: 'L',
+        },
+        relativeTime: {
+            future: function (output) {
+                var affix = /сехет$/i.exec(output)
+                    ? 'рен'
+                    : /ҫул$/i.exec(output)
+                      ? 'тан'
+                      : 'ран';
+                return output + affix;
+            },
+            past: '%s каялла',
+            s: 'пӗр-ик ҫеккунт',
+            ss: '%d ҫеккунт',
+            m: 'пӗр минут',
+            mm: '%d минут',
+            h: 'пӗр сехет',
+            hh: '%d сехет',
+            d: 'пӗр кун',
+            dd: '%d кун',
+            M: 'пӗр уйӑх',
+            MM: '%d уйӑх',
+            y: 'пӗр ҫул',
+            yy: '%d ҫул',
+        },
+        dayOfMonthOrdinalParse: /\d{1,2}-мӗш/,
+        ordinal: '%d-мӗш',
+        week: {
+            dow: 1, // Monday is the first day of the week.
+            doy: 7, // The week that contains Jan 7th is the first week of the year.
+        },
+    });
+
+    return cv;
+
+})));