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

app/platform/layout.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { SessionProvider } from "next-auth/react";
+import { Toaster } from "@/components/ui/toaster";
 
 export default function PlatformLayout({
   children,
@@ -10,6 +11,7 @@ export default function PlatformLayout({
   return (
     <SessionProvider>
       {children}
+      <Toaster />
     </SessionProvider>
   );
 }