feat: establish frontend foundation

src/app/routes/AppRoutes.tsx

@@ -0,0 +1,25 @@
+import { Navigate, Route, Routes } from "react-router";
+
+import { AccountPage } from "../../pages/account";
+import { AccountsPage } from "../../pages/accounts";
+import { LoginPage } from "../../pages/login";
+import { NotFoundPage } from "../../pages/not-found";
+import { RegisterPage } from "../../pages/register";
+import { SettingsPage } from "../../pages/settings";
+import { AppShell } from "../../shared/ui/AppShell";
+
+export function AppRoutes() {
+	return (
+		<Routes>
+			<Route path="/" element={<Navigate to="/accounts" replace />} />
+			<Route path="/login" element={<LoginPage />} />
+			<Route path="/register" element={<RegisterPage />} />
+			<Route element={<AppShell />}>
+				<Route path="/accounts" element={<AccountsPage />} />
+				<Route path="/accounts/:accountId" element={<AccountPage />} />
+				<Route path="/settings" element={<SettingsPage />} />
+			</Route>
+			<Route path="*" element={<NotFoundPage />} />
+		</Routes>
+	);
+}