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/yaml/dist/util.js

@@ -0,0 +1,19 @@
+'use strict';
+
+var resolveSeq = require('./resolveSeq-95613e94.js');
+var PlainValue = require('./PlainValue-516d5bc2.js');
+
+
+
+exports.findPair = resolveSeq.findPair;
+exports.parseMap = resolveSeq.resolveMap;
+exports.parseSeq = resolveSeq.resolveSeq;
+exports.stringifyNumber = resolveSeq.stringifyNumber;
+exports.stringifyString = resolveSeq.stringifyString;
+exports.toJSON = resolveSeq.toJSON;
+exports.Type = PlainValue.Type;
+exports.YAMLError = PlainValue.YAMLError;
+exports.YAMLReferenceError = PlainValue.YAMLReferenceError;
+exports.YAMLSemanticError = PlainValue.YAMLSemanticError;
+exports.YAMLSyntaxError = PlainValue.YAMLSyntaxError;
+exports.YAMLWarning = PlainValue.YAMLWarning;