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/path-case/dist/index.js

@@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.pathCase = void 0;
+var tslib_1 = require("tslib");
+var dot_case_1 = require("dot-case");
+function pathCase(input, options) {
+    if (options === void 0) { options = {}; }
+    return dot_case_1.dotCase(input, tslib_1.__assign({ delimiter: "/" }, options));
+}
+exports.pathCase = pathCase;
+//# sourceMappingURL=index.js.map