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/runtime/helpers/tsRewriteRelativeImportExtensions.js

@@ -0,0 +1,6 @@
+function tsRewriteRelativeImportExtensions(t, e) {
+  return "string" == typeof t && /^\.\.?\//.test(t) ? t.replace(/\.(tsx)$|((?:\.d)?)((?:\.[^./]+)?)\.([cm]?)ts$/i, function (t, s, r, n, o) {
+    return s ? e ? ".jsx" : ".js" : !r || n && o ? r + n + "." + o.toLowerCase() + "js" : t;
+  }) : t;
+}
+module.exports = tsRewriteRelativeImportExtensions, module.exports.__esModule = true, module.exports["default"] = module.exports;