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/find-process/.github/workflows/nodejs.yml

@@ -0,0 +1,39 @@
+# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: Node.js CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        # Operating System Matrix
+        # ubuntu-latest: Latest Ubuntu version (currently 22.04)
+        # windows-latest: Latest Windows Server version (currently 2022)
+        # macos-12: macOS 12 Monterey (released 2021)
+        # macos-13: macOS 13 Ventura (released 2022)
+        # macos-14: macOS 14 Sonoma (released 2023)
+        # macos-15: macOS 15 Sequoia (released 2024)
+        os: [ubuntu-latest, windows-latest, macos-12, macos-13, macos-14, macos-15]
+        # Node.js Version Matrix
+        # 16: Node.js 16.x LTS (released 2020, EOL April 2024)
+        # 18: Node.js 18.x LTS (released 2022, EOL April 2025)
+        # 20: Node.js 20.x LTS (released 2023, EOL April 2026)
+        node: [16, 18, 20]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node }}
+    - run: npm install
+    - run: npm run build --if-present
+    - run: npm test