feat: make staff.aethex.tech work as staff section alias

- Add StaffSubdomainRedirect component: when accessed via staff.aethex.tech,
  auto-redirects to /staff prefix so the subdomain serves the right content
- nginx config updated to proxy to aethex-forge (port 5050) instead of
  dead port 5054

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/App.tsx

@@ -161,6 +161,17 @@ import DeveloperPlatform from "./pages/dev-platform/DeveloperPlatform";
 
 const queryClient = new QueryClient();
 
+// When the app is accessed via staff.aethex.tech, auto-redirect to /staff
+// so the subdomain works as a proper alias for the staff section.
+const StaffSubdomainRedirect = ({ children }: { children: React.ReactNode }) => {
+  const hostname = typeof window !== "undefined" ? window.location.hostname : "";
+  if (hostname === "staff.aethex.tech" && !window.location.pathname.startsWith("/staff")) {
+    window.location.replace("/staff" + window.location.pathname + window.location.search);
+    return null;
+  }
+  return <>{children}</>;
+};
+
 const DiscordActivityWrapper = ({ children }: { children: React.ReactNode }) => {
   const { isActivity } = useDiscordActivity();
   
@@ -181,6 +192,7 @@ const App = () => (
               <Toaster />
               <Analytics />
               <BrowserRouter>
+                <StaffSubdomainRedirect>
                 <DiscordActivityWrapper>
                 <SubdomainPassportProvider>
                   <ArmThemeProvider>
@@ -655,6 +667,7 @@ const App = () => (
                   </ArmThemeProvider>
                 </SubdomainPassportProvider>
                 </DiscordActivityWrapper>
+                </StaffSubdomainRedirect>
               </BrowserRouter>
             </TooltipProvider>
           </DiscordProvider>