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/utils.ts

@@ -0,0 +1,8 @@
+export function escapeHTML(str: string): string {
+	const p = document.createElement("p");
+	p.appendChild(document.createTextNode(str));
+	return p.innerHTML;
+}
+export function isNullish<T>(v: T | undefined | null): v is (null | undefined) {
+	return v === null || v === undefined;
+}