refactor: 个人自用，移除登录与云同步全链路

站点只给本人用，云乐坊 SSO 授权、收藏/历史云同步、获客归因和账号切换记账都没有收益，却被登录状态检查和同步失败提示持续打扰。

- 删除 useYunlefunAuth / yunlefunAuth / yunlefunSsoConfig / yunlefunAuth 适配器、useUserDataSync / userDataSync / userData 适配器、三个 client 插件与 /auth/callback 回调页
- 抽出 adapters/cloudbase.ts，让「反馈一下」和匿名筛选信号不再依赖登录态；cook-feedback 云函数保留
- 删除 cook-user-data 云函数与 cook_user_data 权限规则，移除 @yunlefun/sso 依赖
- 「我的」页删掉登录按钮、账号卡、四个统计格和退出登录；「关于」页删掉项目作者、致谢名单和上游宣传链接
- 本地收藏/历史与导出导入保留，删除同步专用的 lastUid 记账

取舍见 docs/decisions/0005-drop-login-and-sync.md

apps/web/app/composables/store/customRecipe.ts

@@ -4,7 +4,7 @@ import { namespace } from '~/constants'
 
 export type { CustomRecipe }
 
-// 和收藏、历史一样始终保存在本机；不参与云同步
+// 和收藏、历史一样始终保存在本机
 export const customRecipes = useStorage<CustomRecipe[]>(`${namespace}:custom-recipes`, [])
 
 export function getCustomRecipe(customId: string) {

apps/web/app/composables/store/userData.ts

@@ -1,5 +1,4 @@
 import type { UserData, UserDataExportFile } from '~/utils/userData'
-import type { UserDataLocal } from '~/utils/userDataSync'
 import {
   createEmptyUserData,
   createUserDataExport,
@@ -32,22 +31,12 @@ export function writeLocalUserData(data: UserData): void {
   }
 }
 
-export const localUserData: UserDataLocal = {
-  read: readLocalUserData,
-  write: writeLocalUserData,
-  readLastUid: () => userDataMeta.value.lastUid ?? '',
-  writeLastUid: (uid) => {
-    if (userDataMeta.value.lastUid !== uid)
-      userDataMeta.value = { ...userDataMeta.value, lastUid: uid }
-  },
-}
-
 export function exportLocalUserData(now = Date.now()): UserDataExportFile {
   return createUserDataExport(mergeUserData(readLocalUserData(), createEmptyUserData(), now), now)
 }
 
 /**
- * Merge an exported file into local data, using the same rules as cloud sync.
+ * Merge an exported file into local data.
  * Returns null when the text is not a Cook export.
  */
 export function importLocalUserData(text: string, now = Date.now()): { favorites: number, histories: number } | null {

apps/web/app/composables/store/userDataMeta.ts

@@ -3,21 +3,18 @@ import { useStorage } from '@vueuse/core'
 import { namespace } from '~/constants'
 
 /**
- * Sync bookkeeping kept next to `cook:favorites` and `cook:history`, which stay
- * in their original format. Deletions are recorded even when logged out so they
- * can be applied to the cloud after the next login.
+ * Deletion bookkeeping kept next to `cook:favorites` and `cook:history`, which
+ * stay in their original format. Deletions are recorded so they survive an
+ * export/import round trip instead of resurrecting removed records.
  */
 export interface UserDataMeta {
   favoriteRemovals: FavoriteRemoval[]
   historyRemovals: HistoryRemoval[]
   historyClearedAt: number
-  /** The account this device last synced with. */
-  lastUid: string
 }
 
 export const userDataMeta = useStorage<UserDataMeta>(`${namespace}:sync`, {
   favoriteRemovals: [],
   historyRemovals: [],
   historyClearedAt: 0,
-  lastUid: '',
 }, undefined, { mergeDefaults: true })