Initial MVP skeleton with auth, chat persistence, UI and text LLM integration

frontend/app/page.tsx

@@ -0,0 +1,67 @@
+import { cookies } from "next/headers";
+import { redirect } from "next/navigation";
+import Layout from "../components/Layout";
+
+async function getAuthState() {
+  const baseUrl = process.env.INTERNAL_API_URL || process.env.NEXT_PUBLIC_API_BASE_URL || "http://127.0.0.1:18000";
+  const cookieStore = await cookies();
+  const sessionCookie = cookieStore.get("ai_chat_session");
+  
+  if (!sessionCookie) return null;
+  
+  try {
+    const res = await fetch(`${baseUrl}/api/auth/me`, {
+      headers: {
+        Cookie: `${sessionCookie.name}=${sessionCookie.value}`
+      },
+      cache: "no-store"
+    });
+    if (!res.ok) return null;
+    return await res.json();
+  } catch {
+    return null;
+  }
+}
+
+async function getChats() {
+  const baseUrl = process.env.INTERNAL_API_URL || process.env.NEXT_PUBLIC_API_BASE_URL || "http://127.0.0.1:18000";
+  const cookieStore = await cookies();
+  const sessionCookie = cookieStore.get("ai_chat_session");
+  
+  if (!sessionCookie) return [];
+  
+  try {
+    const res = await fetch(`${baseUrl}/api/chats`, {
+      headers: {
+        Cookie: `${sessionCookie.name}=${sessionCookie.value}`
+      },
+      cache: "no-store"
+    });
+    if (!res.ok) return [];
+    return await res.json();
+  } catch {
+    return [];
+  }
+}
+
+export default async function Home() {
+  const auth = await getAuthState();
+  if (!auth) {
+    redirect("/login");
+  }
+  
+  const chats = await getChats();
+
+  return (
+    <Layout chats={chats} user={auth}>
+      <div style={{ flex: 1, display: 'flex', alignItems: 'center', justifyContent: 'center', flexDirection: 'column', color: 'var(--text-muted)' }}>
+        <svg width="64" height="64" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" style={{ opacity: 0.3, marginBottom: 16 }}>
+          <path d="M12 2C6.477 2 2 6.477 2 12C2 17.523 6.477 22 12 22C17.523 22 22 17.523 22 12C22 6.477 17.523 2 12 2ZM12 4C16.418 4 20 7.582 20 12C20 16.418 16.418 20 12 20C7.582 20 4 16.418 4 12C4 7.582 7.582 4 12 4Z" fill="currentColor"/>
+          <path d="M15 13H9C8.448 13 8 12.552 8 12C8 11.448 8.448 11 9 11H15C15.552 11 16 11.448 16 12C16 12.552 15.552 13 15 13Z" fill="currentColor"/>
+        </svg>
+        <div style={{ fontSize: 18, fontWeight: 500, color: 'var(--text-main)', marginBottom: 8 }}>Чем я могу помочь?</div>
+        <div style={{ fontSize: 14 }}>Выберите чат в меню слева или создайте новый.</div>
+      </div>
+    </Layout>
+  );
+}