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/rxjs/tsconfig.json

@@ -0,0 +1,28 @@
+{
+  "compilerOptions": {
+    "incremental": true,
+    "removeComments": true,
+    "preserveConstEnums": true,
+    "sourceMap": true,
+    "strict": true,
+    "noImplicitReturns": true,
+    "moduleResolution": "node",
+    "stripInternal": true,
+    "noEmit": true,
+    "lib": [
+      "esnext",
+      "dom"
+    ],
+    "target": "esnext",
+    "baseUrl": ".",
+    "paths": {
+      "rxjs": ["./src/index"],
+      "rxjs/operators": ["./src/operators/index"],
+      "rxjs/testing": ["./src/testing/index"],
+      "rxjs/ajax": ["./src/ajax/index"],
+      "rxjs/webSocket": ["./src/webSocket/index"],
+      "rxjs/fetch": ["./src/fetch/index"],
+      "rxjs/internal/*": ["./src/internal/*"]
+    }
+  }
+}