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/pac-resolver/dist/util.js

@@ -0,0 +1,22 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.isGMT = exports.dnsLookup = void 0;
+const dns_1 = require("dns");
+function dnsLookup(host, opts) {
+    return new Promise((resolve, reject) => {
+        (0, dns_1.lookup)(host, opts, (err, res) => {
+            if (err) {
+                reject(err);
+            }
+            else {
+                resolve(res);
+            }
+        });
+    });
+}
+exports.dnsLookup = dnsLookup;
+function isGMT(v) {
+    return v === 'GMT';
+}
+exports.isGMT = isGMT;
+//# sourceMappingURL=util.js.map