feat: complete platform management features and enhance SEO

- Add comprehensive company management interface with editing, suspension
- Implement user invitation system within companies
- Add Add Company modal with form validation
- Create platform auth configuration in separate lib file
- Add comprehensive SEO metadata with OpenGraph and structured data
- Fix auth imports and route exports for Next.js 15 compatibility
- Add toast notifications with RadixUI components
- Update TODO status to reflect 100% completion of platform features

package.json

@@ -42,6 +42,7 @@
     "@radix-ui/react-slot": "^1.2.3",
     "@radix-ui/react-switch": "^1.2.5",
     "@radix-ui/react-tabs": "^1.1.12",
+    "@radix-ui/react-toast": "^1.2.14",
     "@radix-ui/react-toggle": "^1.1.9",
     "@radix-ui/react-toggle-group": "^1.1.10",
     "@radix-ui/react-tooltip": "^1.2.7",