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/core-js/object/assign.js

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+module.exports = { "default": require("core-js/library/fn/object/assign"), __esModule: true };

node_modules/babel-runtime/core-js/object/create.js

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+module.exports = { "default": require("core-js/library/fn/object/create"), __esModule: true };

node_modules/babel-runtime/core-js/object/define-properties.js

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+module.exports = { "default": require("core-js/library/fn/object/define-properties"), __esModule: true };

node_modules/babel-runtime/core-js/object/define-property.js

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+module.exports = { "default": require("core-js/library/fn/object/define-property"), __esModule: true };

node_modules/babel-runtime/core-js/object/entries.js

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+module.exports = { "default": require("core-js/library/fn/object/entries"), __esModule: true };

node_modules/babel-runtime/core-js/object/freeze.js

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+module.exports = { "default": require("core-js/library/fn/object/freeze"), __esModule: true };

node_modules/babel-runtime/core-js/object/get-own-property-descriptor.js

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+module.exports = { "default": require("core-js/library/fn/object/get-own-property-descriptor"), __esModule: true };

node_modules/babel-runtime/core-js/object/get-own-property-descriptors.js

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+module.exports = { "default": require("core-js/library/fn/object/get-own-property-descriptors"), __esModule: true };

node_modules/babel-runtime/core-js/object/get-own-property-names.js

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+module.exports = { "default": require("core-js/library/fn/object/get-own-property-names"), __esModule: true };

node_modules/babel-runtime/core-js/object/get-own-property-symbols.js

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+module.exports = { "default": require("core-js/library/fn/object/get-own-property-symbols"), __esModule: true };

node_modules/babel-runtime/core-js/object/get-prototype-of.js

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+module.exports = { "default": require("core-js/library/fn/object/get-prototype-of"), __esModule: true };

node_modules/babel-runtime/core-js/object/is-extensible.js

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+module.exports = { "default": require("core-js/library/fn/object/is-extensible"), __esModule: true };

node_modules/babel-runtime/core-js/object/is-frozen.js

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+module.exports = { "default": require("core-js/library/fn/object/is-frozen"), __esModule: true };

node_modules/babel-runtime/core-js/object/is-sealed.js

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+module.exports = { "default": require("core-js/library/fn/object/is-sealed"), __esModule: true };

node_modules/babel-runtime/core-js/object/is.js

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+module.exports = { "default": require("core-js/library/fn/object/is"), __esModule: true };

node_modules/babel-runtime/core-js/object/keys.js

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+module.exports = { "default": require("core-js/library/fn/object/keys"), __esModule: true };

node_modules/babel-runtime/core-js/object/prevent-extensions.js

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+module.exports = { "default": require("core-js/library/fn/object/prevent-extensions"), __esModule: true };

node_modules/babel-runtime/core-js/object/seal.js

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+module.exports = { "default": require("core-js/library/fn/object/seal"), __esModule: true };

node_modules/babel-runtime/core-js/object/set-prototype-of.js

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+module.exports = { "default": require("core-js/library/fn/object/set-prototype-of"), __esModule: true };

node_modules/babel-runtime/core-js/object/values.js

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+module.exports = { "default": require("core-js/library/fn/object/values"), __esModule: true };