DUNGEONS-34: implement Webka local streaming app

Co-authored-by: multica-agent <github@multica.ai>

frontend/stores/session.ts

@@ -0,0 +1,31 @@
+import { defineStore } from "pinia";
+export interface User {
+  id: string;
+  username: string;
+  role: "admin" | "viewer";
+  session_id: string;
+}
+export const useSessionStore = defineStore("session", () => {
+  const user = ref<User | null>(null);
+  const ready = ref(false);
+  async function refresh() {
+    try {
+      user.value = await $fetch<User>("/api/session");
+      return true;
+    } catch {
+      user.value = null;
+      return false;
+    } finally {
+      ready.value = true;
+    }
+  }
+  async function logout() {
+    try {
+      await $fetch("/api/logout", { method: "POST" });
+    } finally {
+      user.value = null;
+      await navigateTo("/login");
+    }
+  }
+  return { user, ready, refresh, logout };
+});