feat(web): Next.js 15 shell — design tokens, landing, auth pages

apps/web/lib/api.ts

@@ -0,0 +1,33 @@
+const API_BASE = process.env.NEXT_PUBLIC_API_URL ?? 'http://localhost:4000';
+
+export async function apiFetch<T = unknown>(
+  path: string,
+  init: RequestInit = {},
+): Promise<T> {
+  const res = await fetch(`${API_BASE}${path}`, {
+    credentials: 'include',
+    cache: 'no-store',
+    ...init,
+    headers: {
+      'Content-Type': 'application/json',
+      ...(init.headers ?? {}),
+    },
+  });
+  if (!res.ok) {
+    let detail: unknown = undefined;
+    try {
+      detail = await res.json();
+    } catch {}
+    const err = new Error(`api_error_${res.status}`);
+    (err as unknown as { detail?: unknown }).detail = detail;
+    (err as unknown as { status?: number }).status = res.status;
+    throw err;
+  }
+  return (await res.json()) as T;
+}
+
+export function apiWebSocketURL(path: string): string {
+  const httpBase = API_BASE;
+  const wsBase = httpBase.replace(/^http/, 'ws');
+  return `${wsBase}${path}`;
+}

apps/web/lib/cn.ts

@@ -0,0 +1,6 @@
+import { clsx, type ClassValue } from 'clsx';
+import { twMerge } from 'tailwind-merge';
+
+export function cn(...inputs: ClassValue[]): string {
+  return twMerge(clsx(inputs));
+}