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/core-js/features/reflect/apply.js

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+'use strict';
+module.exports = require('../../full/reflect/apply');

node_modules/core-js/features/reflect/construct.js

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+'use strict';
+module.exports = require('../../full/reflect/construct');

node_modules/core-js/features/reflect/define-metadata.js

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+'use strict';
+module.exports = require('../../full/reflect/define-metadata');

node_modules/core-js/features/reflect/define-property.js

@@ -0,0 +1,2 @@
+'use strict';
+module.exports = require('../../full/reflect/define-property');

node_modules/core-js/features/reflect/delete-metadata.js

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+'use strict';
+module.exports = require('../../full/reflect/delete-metadata');

node_modules/core-js/features/reflect/delete-property.js

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+'use strict';
+module.exports = require('../../full/reflect/delete-property');

node_modules/core-js/features/reflect/get-metadata-keys.js

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+'use strict';
+module.exports = require('../../full/reflect/get-metadata-keys');

node_modules/core-js/features/reflect/get-metadata.js

@@ -0,0 +1,2 @@
+'use strict';
+module.exports = require('../../full/reflect/get-metadata');

node_modules/core-js/features/reflect/get-own-metadata-keys.js

@@ -0,0 +1,2 @@
+'use strict';
+module.exports = require('../../full/reflect/get-own-metadata-keys');

node_modules/core-js/features/reflect/get-own-metadata.js

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+'use strict';
+module.exports = require('../../full/reflect/get-own-metadata');

node_modules/core-js/features/reflect/get-own-property-descriptor.js

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+'use strict';
+module.exports = require('../../full/reflect/get-own-property-descriptor');

node_modules/core-js/features/reflect/get-prototype-of.js

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+'use strict';
+module.exports = require('../../full/reflect/get-prototype-of');

node_modules/core-js/features/reflect/get.js

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+'use strict';
+module.exports = require('../../full/reflect/get');

node_modules/core-js/features/reflect/has-metadata.js

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+'use strict';
+module.exports = require('../../full/reflect/has-metadata');

node_modules/core-js/features/reflect/has-own-metadata.js

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+'use strict';
+module.exports = require('../../full/reflect/has-own-metadata');

node_modules/core-js/features/reflect/has.js

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+'use strict';
+module.exports = require('../../full/reflect/has');

node_modules/core-js/features/reflect/index.js

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+'use strict';
+module.exports = require('../../full/reflect');

node_modules/core-js/features/reflect/is-extensible.js

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+'use strict';
+module.exports = require('../../full/reflect/is-extensible');

node_modules/core-js/features/reflect/metadata.js

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+'use strict';
+module.exports = require('../../full/reflect/metadata');

node_modules/core-js/features/reflect/own-keys.js

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+'use strict';
+module.exports = require('../../full/reflect/own-keys');

node_modules/core-js/features/reflect/prevent-extensions.js

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+'use strict';
+module.exports = require('../../full/reflect/prevent-extensions');

node_modules/core-js/features/reflect/set-prototype-of.js

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+'use strict';
+module.exports = require('../../full/reflect/set-prototype-of');

node_modules/core-js/features/reflect/set.js

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+'use strict';
+module.exports = require('../../full/reflect/set');

node_modules/core-js/features/reflect/to-string-tag.js

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+'use strict';
+module.exports = require('../../full/reflect/to-string-tag');