feat(frontend): added frontend

- Router: client side route handling with client side rendering
- Toast: rought Toast handling for better UX and messaging
- Auth: single point of truth for the Logged in user

This commit doesnt not include the openapi generated code

frontend/src/routing/special_routes.ts

@@ -0,0 +1,12 @@
+import { escapeHTML } from "@app/utils";
+import { getRoute, type RouteHandlerParams } from "@app/routing";
+
+export async function route_404(url: string, _args: RouteHandlerParams): Promise<string> {
+	console.log(`asked about route '${url}: not found'`)
+	console.log(getRoute())
+	return `
+		<div> 404 - Not Found </div>
+		<hr />
+		<center> ${escapeHTML(url)} </center>
+	`
+}