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/symbol/async-dispose.js

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+'use strict';
+module.exports = require('../../full/symbol/async-dispose');

node_modules/core-js/features/symbol/async-iterator.js

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+'use strict';
+module.exports = require('../../full/symbol/async-iterator');

node_modules/core-js/features/symbol/custom-matcher.js

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+'use strict';
+module.exports = require('../../full/symbol/custom-matcher');

node_modules/core-js/features/symbol/description.js

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

node_modules/core-js/features/symbol/dispose.js

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

node_modules/core-js/features/symbol/for.js

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

node_modules/core-js/features/symbol/has-instance.js

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

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

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

node_modules/core-js/features/symbol/is-concat-spreadable.js

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+'use strict';
+module.exports = require('../../full/symbol/is-concat-spreadable');

node_modules/core-js/features/symbol/is-registered-symbol.js

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

node_modules/core-js/features/symbol/is-registered.js

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

node_modules/core-js/features/symbol/is-well-known-symbol.js

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+'use strict';
+module.exports = require('../../full/symbol/is-well-known-symbol');

node_modules/core-js/features/symbol/is-well-known.js

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+'use strict';
+module.exports = require('../../full/symbol/is-well-known');

node_modules/core-js/features/symbol/iterator.js

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

node_modules/core-js/features/symbol/key-for.js

@@ -0,0 +1,2 @@
+'use strict';
+module.exports = require('../../full/symbol/key-for');

node_modules/core-js/features/symbol/match-all.js

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+'use strict';
+module.exports = require('../../full/symbol/match-all');

node_modules/core-js/features/symbol/match.js

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

node_modules/core-js/features/symbol/matcher.js

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

node_modules/core-js/features/symbol/metadata-key.js

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

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

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

node_modules/core-js/features/symbol/observable.js

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

node_modules/core-js/features/symbol/pattern-match.js

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+'use strict';
+module.exports = require('../../full/symbol/pattern-match');

node_modules/core-js/features/symbol/replace-all.js

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+'use strict';
+module.exports = require('../../full/symbol/replace-all');

node_modules/core-js/features/symbol/replace.js

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

node_modules/core-js/features/symbol/search.js

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

node_modules/core-js/features/symbol/species.js

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

node_modules/core-js/features/symbol/split.js

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

node_modules/core-js/features/symbol/to-primitive.js

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+'use strict';
+module.exports = require('../../full/symbol/to-primitive');

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

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

node_modules/core-js/features/symbol/unscopables.js

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