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/framer-motion/dist/es/context/MotionContext/create.mjs

@@ -0,0 +1,13 @@
+import { useContext, useMemo } from 'react';
+import { MotionContext } from './index.mjs';
+import { getCurrentTreeVariants } from './utils.mjs';
+
+function useCreateMotionContext(props) {
+    const { initial, animate } = getCurrentTreeVariants(props, useContext(MotionContext));
+    return useMemo(() => ({ initial, animate }), [variantLabelsAsDependency(initial), variantLabelsAsDependency(animate)]);
+}
+function variantLabelsAsDependency(prop) {
+    return Array.isArray(prop) ? prop.join(" ") : prop;
+}
+
+export { useCreateMotionContext };