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/comment-parser/es6/parser/tokenizers/description.js

@@ -0,0 +1,47 @@
+import { Markers } from '../../primitives.js';
+/**
+ * Makes no changes to `spec.lines[].tokens` but joins them into `spec.description`
+ * following given spacing srtategy
+ * @param {Spacing} spacing tells how to handle the whitespace
+ * @param {BlockMarkers} markers tells how to handle comment block delimitation
+ */
+export default function descriptionTokenizer(spacing = 'compact', markers = Markers) {
+    const join = getJoiner(spacing);
+    return (spec) => {
+        spec.description = join(spec.source, markers);
+        return spec;
+    };
+}
+export function getJoiner(spacing) {
+    if (spacing === 'compact')
+        return compactJoiner;
+    if (spacing === 'preserve')
+        return preserveJoiner;
+    return spacing;
+}
+function compactJoiner(lines, markers = Markers) {
+    return lines
+        .map(({ tokens: { description } }) => description.trim())
+        .filter((description) => description !== '')
+        .join(' ');
+}
+const lineNo = (num, { tokens }, i) => tokens.type === '' ? num : i;
+const getDescription = ({ tokens }) => (tokens.delimiter === '' ? tokens.start : tokens.postDelimiter.slice(1)) +
+    tokens.description;
+function preserveJoiner(lines, markers = Markers) {
+    if (lines.length === 0)
+        return '';
+    // skip the opening line with no description
+    if (lines[0].tokens.description === '' &&
+        lines[0].tokens.delimiter === markers.start)
+        lines = lines.slice(1);
+    // skip the closing line with no description
+    const lastLine = lines[lines.length - 1];
+    if (lastLine !== undefined &&
+        lastLine.tokens.description === '' &&
+        lastLine.tokens.end.endsWith(markers.end))
+        lines = lines.slice(0, -1);
+    // description starts at the last line of type definition
+    lines = lines.slice(lines.reduce(lineNo, 0));
+    return lines.map(getDescription).join('\n');
+}