feat(admin): 增加 Maildir 同步健康状态

- 新增后端健康检查接口与同步追踪，记录运行状态、最近结果、错误摘要和统计信息。
- 前端管理页在存储设置中展示 Maildir 同步健康卡片，并支持手动刷新。
- 补充相关类型定义与测试，覆盖未配置和同步成功两类场景。

apps/web/src/lib/api-types.ts

@@ -79,6 +79,21 @@ export type BlockedSender = { id: string; mailboxId: string; email: string; reas
 export type MailStats = { totalMessages: number; unreadMessages: number; starredMessages: number; attachmentCount: number; storageBytes: number; byFolder: { folder: string; role: string; count: number; unread: number; bytes: number }[] }
 export type MailTemplate = { key: string; name: string; subject: string; bodyText: string; bodyHtml: string; updatedAt: string }
 export type MailboxApplyOptions = { enabled: boolean; domains: Domain[]; reservedPrefixes?: string[] }
+export type MaildirSyncCounts = { filesScanned: number; imported: number; backfilled: number; cleaned: number; fileErrors: number }
+export type MaildirSyncRun = { startedAt: string; finishedAt?: string; durationMs: number; status: "running" | "success" | "partial" | "error"; error?: string; counts: MaildirSyncCounts }
+export type MaildirSyncHealth = {
+  configured: boolean
+  enabled: boolean
+  root: string
+  scanSeconds: number
+  workerStarted: boolean
+  running: boolean
+  lastRun?: MaildirSyncRun
+  lastError?: string
+  nextRunAt?: string
+  recentErrors: string[]
+  summary: MaildirSyncCounts
+}
 export type SystemSettings = {
   publicHostname: string
   publicBaseUrl: string

apps/web/src/lib/api.ts

@@ -1,4 +1,4 @@
-import type { User, AdminUser, AdminOverview, Domain, Mailbox, Alias, MailFolder, Attachment, MailLabel, MailMessage, DNSRecord, DNSCheckResult, ListResponse, SendPayload, DraftPayload, ScheduleSendPayload, ScheduledSend, Contact, MailSignature, MailRule, MailRuleCondition, MailRuleAction, BlockedSender, MailStats, MailboxApplyOptions, MailTemplate, SystemSettings, SystemSettingsPayload, PublicSettings, LoginPayload, LoginResponse, RegisterPayload, PermissionGroup, PermissionInfo, PermissionKey, PermissionLimits } from "./api-types"
+import type { User, AdminUser, AdminOverview, Domain, Mailbox, Alias, MailFolder, Attachment, MailLabel, MailMessage, DNSRecord, DNSCheckResult, ListResponse, SendPayload, DraftPayload, ScheduleSendPayload, ScheduledSend, Contact, MailSignature, MailRule, MailRuleCondition, MailRuleAction, BlockedSender, MailStats, MailboxApplyOptions, MailTemplate, MaildirSyncHealth, SystemSettings, SystemSettingsPayload, PublicSettings, LoginPayload, LoginResponse, RegisterPayload, PermissionGroup, PermissionInfo, PermissionKey, PermissionLimits } from "./api-types"
 export * from "./api-types"
 
 const REQUEST_TIMEOUT_MS = 15_000
@@ -95,6 +95,7 @@ export const api = {
   },
   adminMessage: (id: string) => request<MailMessage>(`/api/admin/messages/${id}`),
   systemSettings: () => request<SystemSettings>("/api/admin/settings"),
+  maildirSyncHealth: () => request<MaildirSyncHealth>("/api/admin/maildir-sync/health"),
   updateSystemSettings: (payload: SystemSettingsPayload) => request<SystemSettings>("/api/admin/settings", { method: "POST", body: JSON.stringify(payload) }),
   testSmtp: (to: string) => request<{ ok: boolean }>("/api/admin/settings/test-smtp", { method: "POST", body: JSON.stringify({ to }), timeoutMs: MAIL_DELIVERY_TIMEOUT_MS }),
   mailTemplates: () => request<ListResponse<MailTemplate>>("/api/admin/mail-templates"),