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/webpack/schemas/plugins/optimize/AggressiveSplittingPlugin.check.js

@@ -0,0 +1,6 @@
+/*
+ * This file was automatically generated.
+ * DO NOT MODIFY BY HAND.
+ * Run `yarn fix:special` to update
+ */
+"use strict";function r(e,{instancePath:t="",parentData:n,parentDataProperty:i,rootData:o=e}={}){if(!e||"object"!=typeof e||Array.isArray(e))return r.errors=[{params:{type:"object"}}],!1;{const t=0;for(const t in e)if("chunkOverhead"!==t&&"entryChunkMultiplicator"!==t&&"maxSize"!==t&&"minSize"!==t)return r.errors=[{params:{additionalProperty:t}}],!1;if(0===t){if(void 0!==e.chunkOverhead){const t=0;if("number"!=typeof e.chunkOverhead)return r.errors=[{params:{type:"number"}}],!1;var a=0===t}else a=!0;if(a){if(void 0!==e.entryChunkMultiplicator){const t=0;if("number"!=typeof e.entryChunkMultiplicator)return r.errors=[{params:{type:"number"}}],!1;a=0===t}else a=!0;if(a){if(void 0!==e.maxSize){const t=0;if("number"!=typeof e.maxSize)return r.errors=[{params:{type:"number"}}],!1;a=0===t}else a=!0;if(a)if(void 0!==e.minSize){const t=0;if("number"!=typeof e.minSize)return r.errors=[{params:{type:"number"}}],!1;a=0===t}else a=!0}}}}return r.errors=null,!0}module.exports=r,module.exports.default=r;