feat(agent): 支持持久化 /btw 旁路提问

web/src/lib/api.ts

@@ -91,7 +91,7 @@ function getToken(): string | null {
   return localStorage.getItem("artex_token");
 }
 
-async function http<T>(path: string, init?: RequestInit): Promise<T> {
+export async function http<T>(path: string, init?: RequestInit): Promise<T> {
   if (MOCK) return mockHandle<T>(init?.method ?? "GET", path, init?.body ?? null);
   const token = getToken();
   const r = await fetch(`/api${path}`, {

web/src/lib/side-questions.ts

@@ -0,0 +1,43 @@
+import { http } from "@/lib/api";
+
+export interface SideModel {
+  model: string;
+  name: string;
+  format: string;
+  profile_id: number;
+}
+export interface SideExchange {
+  id: string;
+  ordinal: number;
+  client_request_id: string;
+  question: string;
+  answer: string;
+  status: "running" | "completed" | "failed" | "cancelled" | "interrupted";
+  error?: string;
+  model: SideModel;
+  snapshot_at: string;
+  created_at: string;
+  sequence: number;
+}
+export interface SideHistory {
+  items: SideExchange[];
+  current: SideExchange | null;
+  next_cursor: number;
+  snapshot: { captured_at: string; model: SideModel; available: boolean; reason: string } | null;
+}
+
+async function request<T>(path: string, method = "GET", body?: unknown): Promise<T> {
+  return http<T>(path.replace(/^\/api/, ""), { method, body: body === undefined ? undefined : JSON.stringify(body) });
+}
+
+export const sideAPI = {
+  history: (parent: string, before = 0) => request<SideHistory>(`${parent}/side-questions?before=${before}`),
+  ask: (parent: string, question: string, client_request_id: string) =>
+    request<SideExchange>(`${parent}/side-questions`, "POST", { question, client_request_id }),
+  clear: (parent: string) => request(`${parent}/side-questions`, "DELETE"),
+  cancel: (id: string) => request(`/api/side-questions/${id}/cancel`, "POST"),
+};
+
+export function isBtwCommand(text: string) {
+  return /^\/btw(?:\s|$)/.test(text.trim());
+}