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/ajv/lib/dot/pattern.jst

@@ -0,0 +1,25 @@
+{{# def.definitions }}
+{{# def.errors }}
+{{# def.setupKeyword }}
+{{# def.$data }}
+
+{{
+  var $regExpCode = it.opts.regExp ? 'regExp' : 'new RegExp';
+}}
+
+{{? $isData }}
+  var {{=$valid}} = true;
+  try {
+    {{=$valid}} = {{=$regExpCode}}({{=$schemaValue}}).test({{=$data}});
+  } catch(e) {
+    {{=$valid}} = false;
+  }
+  if ({{# def.$dataNotType:'string' }} !{{=$valid}}) {
+{{??}}
+  {{
+    var $regexp = it.usePattern($schema);
+  }}
+  if ({{# def.$dataNotType:'string' }} !{{=$regexp}}.test({{=$data}}) ) {
+{{?}}
+  {{# def.error:'pattern' }}
+} {{? $breakOnError }} else { {{?}}