feat: show app version in sidebar, remove version from about page

Displays the app version below the Elysium title in the sidebar.
Removes the separate client/API version cards from the About panel.
Also fixes the Vite dev proxy port to match the API server.

apps/web/vite.config.ts

@@ -15,7 +15,7 @@ export default defineConfig({
     port: 5173,
     proxy: {
       "/api": {
-        target: "http://localhost:3001",
+        target: "http://localhost:3898",
         rewrite: (path) => path.replace(/^\/api/, ""),
       },
     },