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/date-fns/esm/locale/fr-CH/_lib/formatLong/index.js

@@ -0,0 +1,34 @@
+import buildFormatLongFn from "../../../_lib/buildFormatLongFn/index.js";
+var dateFormats = {
+  full: 'EEEE d MMMM y',
+  long: 'd MMMM y',
+  medium: 'd MMM y',
+  short: 'dd.MM.y'
+};
+var timeFormats = {
+  full: 'HH:mm:ss zzzz',
+  long: 'HH:mm:ss z',
+  medium: 'HH:mm:ss',
+  short: 'HH:mm'
+};
+var dateTimeFormats = {
+  full: "{{date}} 'à' {{time}}",
+  long: "{{date}} 'à' {{time}}",
+  medium: '{{date}}, {{time}}',
+  short: '{{date}}, {{time}}'
+};
+var formatLong = {
+  date: buildFormatLongFn({
+    formats: dateFormats,
+    defaultWidth: 'full'
+  }),
+  time: buildFormatLongFn({
+    formats: timeFormats,
+    defaultWidth: 'full'
+  }),
+  dateTime: buildFormatLongFn({
+    formats: dateTimeFormats,
+    defaultWidth: 'full'
+  })
+};
+export default formatLong;

node_modules/date-fns/esm/locale/fr-CH/_lib/formatRelative/index.js

@@ -0,0 +1,12 @@
+var formatRelativeLocale = {
+  lastWeek: "eeee 'la semaine dernière à' p",
+  yesterday: "'hier à' p",
+  today: "'aujourd’hui à' p",
+  tomorrow: "'demain à' p'",
+  nextWeek: "eeee 'la semaine prochaine à' p",
+  other: 'P'
+};
+var formatRelative = function formatRelative(token, _date, _baseDate, _options) {
+  return formatRelativeLocale[token];
+};
+export default formatRelative;