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/comment-parser/lib/stringifier/index.cjs

@@ -0,0 +1,18 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+function join(tokens) {
+  return tokens.start + tokens.delimiter + tokens.postDelimiter + tokens.tag + tokens.postTag + tokens.type + tokens.postType + tokens.name + tokens.postName + tokens.description + tokens.end + tokens.lineEnd;
+}
+
+function getStringifier() {
+  return block => block.source.map(({
+    tokens
+  }) => join(tokens)).join('\n');
+}
+
+exports.default = getStringifier;
+//# sourceMappingURL=index.cjs.map