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/@nodelib/fs.stat/out/settings.js

@@ -0,0 +1,16 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const fs = require("./adapters/fs");
+class Settings {
+    constructor(_options = {}) {
+        this._options = _options;
+        this.followSymbolicLink = this._getValue(this._options.followSymbolicLink, true);
+        this.fs = fs.createFileSystemAdapter(this._options.fs);
+        this.markSymbolicLink = this._getValue(this._options.markSymbolicLink, false);
+        this.throwErrorOnBrokenSymbolicLink = this._getValue(this._options.throwErrorOnBrokenSymbolicLink, true);
+    }
+    _getValue(option, value) {
+        return option !== null && option !== void 0 ? option : value;
+    }
+}
+exports.default = Settings;