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-modules-commonjs/lib/lazy.js

@@ -0,0 +1,44 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.lazyImportsHook = void 0;
+var _core = require("@babel/core");
+var _helperModuleTransforms = require("@babel/helper-module-transforms");
+const lazyImportsHook = lazy => ({
+  name: `${"@babel/plugin-transform-modules-commonjs"}/lazy`,
+  version: "7.28.6",
+  getWrapperPayload(source, metadata) {
+    if ((0, _helperModuleTransforms.isSideEffectImport)(metadata) || metadata.reexportAll) {
+      return null;
+    }
+    if (lazy === true) {
+      return source.includes(".") ? null : "lazy/function";
+    }
+    if (Array.isArray(lazy)) {
+      return !lazy.includes(source) ? null : "lazy/function";
+    }
+    if (typeof lazy === "function") {
+      return lazy(source) ? "lazy/function" : null;
+    }
+  },
+  buildRequireWrapper(name, init, payload, referenced) {
+    if (payload === "lazy/function") {
+      if (!referenced) return false;
+      return _core.template.statement.ast`
+        function ${name}() {
+          const data = ${init};
+          ${name} = function(){ return data; };
+          return data;
+        }
+      `;
+    }
+  },
+  wrapReference(ref, payload) {
+    if (payload === "lazy/function") return _core.types.callExpression(ref, []);
+  }
+});
+exports.lazyImportsHook = lazyImportsHook;
+
+//# sourceMappingURL=lazy.js.map