fix(data): 串行化 AppData 同 key 保存

apps/web/lib/server-data.ts

@@ -36,6 +36,7 @@ const serverDataCache = new Map<ServerDataKey, {
   loadedAt: number;
 }>();
 const serverDataLoadPromises = new Map<ServerDataKey, Promise<unknown | null>>();
+const serverDataSaveQueues = new Map<ServerDataKey, Promise<void>>();
 export const SERVER_DATA_CACHE_MS = 30_000;
 export const SERVER_DATA_SAVE_ERROR_EVENT = 'ftb:server-data-save-error';
 
@@ -110,7 +111,20 @@ export async function loadServerData<T>(
   return promise;
 }
 
-export async function saveServerData<T>(key: ServerDataKey, value: T): Promise<void> {
+export function saveServerData<T>(key: ServerDataKey, value: T): Promise<void> {
+  const previousSave = serverDataSaveQueues.get(key) ?? Promise.resolve();
+  const save = previousSave.then(() => putServerData(key, value));
+  const queueTail = save.catch(() => undefined);
+  serverDataSaveQueues.set(key, queueTail);
+  void queueTail.then(() => {
+    if (serverDataSaveQueues.get(key) === queueTail) {
+      serverDataSaveQueues.delete(key);
+    }
+  });
+  return save;
+}
+
+async function putServerData<T>(key: ServerDataKey, value: T): Promise<void> {
   const payload: { value: T; version?: string | null } = { value };
   if (serverDataVersions.has(key)) {
     payload.version = serverDataVersions.get(key) ?? null;