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/prompts/dist/dateparts/datepart.js

@@ -0,0 +1,39 @@
+'use strict';
+
+class DatePart {
+  constructor({
+    token,
+    date,
+    parts,
+    locales
+  }) {
+    this.token = token;
+    this.date = date || new Date();
+    this.parts = parts || [this];
+    this.locales = locales || {};
+  }
+
+  up() {}
+
+  down() {}
+
+  next() {
+    const currentIdx = this.parts.indexOf(this);
+    return this.parts.find((part, idx) => idx > currentIdx && part instanceof DatePart);
+  }
+
+  setTo(val) {}
+
+  prev() {
+    let parts = [].concat(this.parts).reverse();
+    const currentIdx = parts.indexOf(this);
+    return parts.find((part, idx) => idx > currentIdx && part instanceof DatePart);
+  }
+
+  toString() {
+    return String(this.date);
+  }
+
+}
+
+module.exports = DatePart;