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/@babel/helper-define-polyfill-provider/lib/debug-utils.js

@@ -0,0 +1,14 @@
+"use strict";
+
+exports.__esModule = true;
+exports.presetEnvSilentDebugHeader = void 0;
+exports.stringifyTargets = stringifyTargets;
+exports.stringifyTargetsMultiline = stringifyTargetsMultiline;
+var _helperCompilationTargets = require("@babel/helper-compilation-targets");
+const presetEnvSilentDebugHeader = exports.presetEnvSilentDebugHeader = "#__secret_key__@babel/preset-env__don't_log_debug_header_and_resolved_targets";
+function stringifyTargetsMultiline(targets) {
+  return JSON.stringify((0, _helperCompilationTargets.prettifyTargets)(targets), null, 2);
+}
+function stringifyTargets(targets) {
+  return JSON.stringify(targets).replace(/,/g, ", ").replace(/^\{"/, '{ "').replace(/"\}$/, '" }');
+}