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/plugin-transform-react-jsx-development/lib/index.js

@@ -0,0 +1,10 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _development = require("@babel/plugin-transform-react-jsx/lib/development");
+var _default = exports.default = _development.default;
+
+//# sourceMappingURL=index.js.map

node_modules/@babel/plugin-transform-react-jsx-development/lib/index.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["_development","require","_default","exports","default","plugin"],"sources":["../src/index.ts"],"sourcesContent":["/* eslint-disable @babel/development/plugin-name */\n\nimport plugin from \"@babel/plugin-transform-react-jsx/lib/development\";\n// We need to explicitly annotate this export because\n// @babel/plugin-transform-react-jsx/lib/development has no type definitions\n// (it's not a public entry point)\n// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion\nexport default plugin as typeof import(\"@babel/plugin-transform-react-jsx\").default;\n"],"mappings":";;;;;;AAEA,IAAAA,YAAA,GAAAC,OAAA;AAAuE,IAAAC,QAAA,GAAAC,OAAA,CAAAC,OAAA,GAKxDC,oBAAM","ignoreList":[]}