Fix frontend imports and track frontend lib files

frontend/lib/api.ts

@@ -0,0 +1,60 @@
+import type { CreateMindmapPayload, Mindmap } from "../types/mindmap";
+
+const API_BASE_URL =
+  process.env.NEXT_PUBLIC_API_BASE_URL ?? "http://127.0.0.1:8000";
+
+async function request<T>(path: string, init?: RequestInit): Promise<T> {
+  const response = await fetch(`${API_BASE_URL}${path}`, {
+    ...init,
+    headers: {
+      "Content-Type": "application/json",
+      ...(init?.headers ?? {}),
+    },
+    cache: "no-store",
+  });
+
+  if (!response.ok) {
+    const message = await response.text();
+    throw new Error(message || "请求失败");
+  }
+
+  return (await response.json()) as T;
+}
+
+export async function createMindmap(
+  payload: CreateMindmapPayload,
+): Promise<Mindmap> {
+  return request<Mindmap>("/api/mindmaps", {
+    method: "POST",
+    body: JSON.stringify(payload),
+  });
+}
+
+export async function getMindmap(uniqueId: string): Promise<Mindmap> {
+  return request<Mindmap>(`/api/mindmaps/${uniqueId}`);
+}
+
+export async function sendChatMessage(
+  sessionId: string,
+  content: string,
+  visitorBizId: string = "default_visitor",
+  signal?: AbortSignal,
+): Promise<Response> {
+  const response = await fetch(`${API_BASE_URL}/api/chat`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    signal,
+    body: JSON.stringify({
+      session_id: sessionId,
+      content,
+      visitor_biz_id: visitorBizId,
+    }),
+  });
+
+  if (!response.ok) {
+    const message = await response.text();
+    throw new Error(message || "请求失败");
+  }
+
+  return response;
+}