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/wildcard/test/arrays.js

@@ -0,0 +1,33 @@
+var test = require('tape'),
+    wildcard = require('../'),
+    testdata = [
+        'a.b.c',
+        'a.b',
+        'a',
+        'a.b.d'
+    ],
+    testdataSep = [
+        'a:b:c',
+        'a:b',
+        'a',
+        'a:b:d'
+    ];
+
+test('array result matching tests', function(t) {
+    t.plan(5);
+
+    t.equal(wildcard('*', testdata).length, 4, '* matches all testdata');
+    t.equal(wildcard('a.*', testdata).length, 4, '4 matches found');
+    t.equal(wildcard('a.b.*', testdata).length, 3, '3 matches found');
+    t.equal(wildcard('a.*.c', testdata).length, 1);
+    t.equal(wildcard('b.*.d', testdata).length, 0);
+});
+
+test('array result with separator matching tests', function(t) {
+    t.plan(4);
+
+    t.equal(wildcard('a:*', testdataSep, ':').length, 4, '4 matches found');
+    t.equal(wildcard('a:b:*', testdataSep, ':').length, 3, '3 matches found');
+    t.equal(wildcard('a:*:c', testdataSep, ':').length, 1);
+    t.equal(wildcard('b:*:d', testdataSep, ':').length, 0);
+});