Store calculation history on server with bazi input and chart snapshots.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/history/request-user.ts

@@ -0,0 +1,12 @@
+import { cookies } from "next/headers";
+import { isAuthEnabled } from "@/lib/auth/config";
+import { getSessionUsername, SESSION_COOKIE } from "@/lib/auth/session";
+
+export async function getHistoryUsername(): Promise<string | null> {
+  if (!isAuthEnabled()) {
+    return "guest";
+  }
+  const cookieStore = await cookies();
+  const token = cookieStore.get(SESSION_COOKIE)?.value;
+  return getSessionUsername(token);
+}