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/visitors/entry.js

@@ -0,0 +1,26 @@
+"use strict";
+
+exports.__esModule = true;
+exports.default = void 0;
+var _utils = require("../utils");
+var _default = callProvider => ({
+  ImportDeclaration(path) {
+    const source = (0, _utils.getImportSource)(path);
+    if (!source) return;
+    callProvider({
+      kind: "import",
+      source
+    }, path);
+  },
+  Program(path) {
+    path.get("body").forEach(bodyPath => {
+      const source = (0, _utils.getRequireSource)(bodyPath);
+      if (!source) return;
+      callProvider({
+        kind: "import",
+        source
+      }, bodyPath);
+    });
+  }
+});
+exports.default = _default;