Add JRPC API, reworked Login and User pages

Frontend/src/pages/login/TF/WebAuthn.svelte

@@ -0,0 +1,28 @@
+<script lang="ts">
+  import { onMount } from "svelte";
+  import Error from "../Error.svelte";
+  import loginState from "../state";
+  import { startAuthentication } from "@simplewebauthn/browser";
+
+  export let id: string;
+
+  async function doAuth() {
+    let challenge = await loginState.getWebAuthnChallenge(id);
+    try {
+      loginState.setLoading(true);
+      let result = await startAuthentication(JSON.parse(challenge));
+      await loginState.useWebAuthn(id, result);
+    } catch (e) {
+      loginState.setError(e.message);
+      return;
+    } finally {
+      loginState.setLoading(false);
+    }
+  }
+
+  onMount(() => {
+    doAuth();
+  });
+</script>
+
+<Error />