feat(web): 历史解卦列表、结果页与追问功能

- 合并 DivinationResultPage 和 HistoryResultPage 为统一结果页
- 重写 HistoryFollowUpPage：API 加载历史消息、SSE 流式追问、配额管理
- 追问免费且限一次，输入框 UI 对齐设计稿（圆角容器+配额徽章+圆形发送按钮）
- 结果页追问状态根据线程消息数动态判断
- 历史列表筛选改为 9 类独立类型
- 提取 historyMessageToResultData 为共享函数，新增 enqueueFollowUpRun API
- 新增 auto_awesome/search/arrow_upward 图标
- 新增三语言 [id].astro、[id]/followup.astro、divination/result.astro 页面

web/src/lib/auth.ts

@@ -237,3 +237,39 @@ export async function authFetch<T>(path: string, options?: RequestInit): Promise
   if (res.status === 204) return undefined as T;
   return res.json() as Promise<T>;
 }
+
+/**
+ * Like authFetch but returns raw Response for streaming (SSE, etc.)
+ * Does NOT throw on non-OK responses - caller must handle response.status
+ */
+export async function authFetchRaw(path: string, options?: RequestInit): Promise<Response> {
+  if (isTokenExpired()) {
+    await refreshAccessToken();
+  }
+
+  const auth = getAuth();
+  if (!auth) {
+    redirectToLogin();
+    throw new Error('Not authenticated');
+  }
+
+  const headers = jsonHeaders(options);
+  headers.set('Authorization', `Bearer ${auth.access_token}`);
+
+  const url = apiUrl(path);
+  let res = await fetch(url, { ...options, headers });
+
+  if (res.status === 401) {
+    await refreshAccessToken();
+    const refreshed = getAuth();
+    if (!refreshed) {
+      redirectToLogin();
+      throw new Error('Not authenticated');
+    }
+    const retryHeaders = jsonHeaders(options);
+    retryHeaders.set('Authorization', `Bearer ${refreshed.access_token}`);
+    res = await fetch(url, { ...options, headers: retryHeaders });
+  }
+
+  return res;
+}