Fix asset paths and routing issues

- Fix asset paths from /react/templateassets/ to /react/assets/
- Fix missing slash in asset paths (/reactassets/ to /react/assets/)
- Update environment.jsx to ensure base_path always has trailing slash
- Fix BrowserRouter basename configuration
- Update Header.jsx exclusionArray paths
- Fix themeSettings and rightSidebar asset paths

src/index.js

@@ -25,7 +25,7 @@ if (rootElement) {
   root.render(
     <React.StrictMode>
     <Provider store={store} >
-      <BrowserRouter basename={base_path}>
+      <BrowserRouter basename={process.env.PUBLIC_URL}>
       <AllRoutes />
 
       </BrowserRouter>