feat: 本地 HTTP API + 设置面板 + 账号自助入口

让 WechatExplorer 既能用图形界面浏览聊天记录,也能作为本机 MCP 数据源被
Claude / Codex 等客户端通过 127.0.0.1:6131 直接拉取。

本机 HTTP API
  - 新增 http-server: 8 个端点,覆盖 health / current_time / contact /
    chatroom / recent_chat / chatlog / group_snapshot / resolve / report
  - 时间参数支持 YYYY-MM-DD / YYYY-MM-DD/HH:mm / Unix 秒级;日期单独使用
    时自动补到 00:00:00~23:59:59,避免漏消息
  - apiServer 单例支持动态启停,启动失败返回 friendlyMessage(把
    EADDRINUSE 翻译成"端口已被占用"的中文错误并附 4 次重试)

数据库根目录与自服务入口
  - Wcdb4Client 接受 accountRoot 时会自动解析:父目录下找最新含
    db_storage 的 wxid 子目录;设置面板"测试连接"成功后回写解析后的
    精确路径
  - 抽 chat-service.ts:IPC 和 HTTP 共享 listContacts / listMessages /
    getGroupSnapshot / searchMessages / getSelfAccountInfo / testConnection
    / reopenWithRoot
  - WechatDb 接受可选 accountRoot;设置面板新增"应用并重新初始化"
    按钮,改完 dbRoot 立即生效
  - 新增 settings-store.ts,dbRoot / apiEnabled / apiHost / apiPort 落到
    userData/settings.json

主进程健壮性
  - 新增 safe-log.ts 包一层 console.log/warn/error,electron-vite 关闭
    子进程 stderr 后写 EPIPE 不再炸 IPC handler(原 main build 启动时
    即 installSafeConsole)

src/preload/index.d.ts

@@ -81,6 +81,67 @@ declare global {
       clearSavedDbKey: () => Promise<{ success: boolean; error?: string }>
       onWcdbChange: (callback: (payload: { type: string; json: string }) => void) => () => void
       onDbKeyStatus: (callback: (payload: { message: string }) => void) => () => void
+      getSettings: () => Promise<{
+        settings: {
+          dbRoot: string
+          apiEnabled: boolean
+          apiHost: string
+          apiPort: number
+        }
+        settingsPath: string
+      }>
+      setSettings: (patch: Partial<{
+        dbRoot: string
+        apiEnabled: boolean
+        apiHost: string
+        apiPort: number
+      }>) => Promise<{
+        settings: {
+          dbRoot: string
+          apiEnabled: boolean
+          apiHost: string
+          apiPort: number
+        }
+        settingsPath: string
+      }>
+      getSelf: () => Promise<
+        | {
+            ready: true
+            info: { wxid: string; nickname: string; avatar?: string; accountRoot: string }
+          }
+        | { ready: false }
+      >
+      testConnection: (
+        key: string,
+        accountRoot?: string
+      ) => Promise<{
+        success: boolean
+        error?: string
+        accountRoot?: string
+        wxid?: string
+      }>
+      reopenWithRoot: (accountRoot: string) => Promise<{
+        success: boolean
+        error?: string
+        info?: { wxid: string; nickname: string; avatar?: string; accountRoot: string }
+      }>
+      apiStatus: () => Promise<{
+        running: boolean
+        host: string
+        port: number
+        error?: string
+      }>
+      apiStart: (
+        host?: string,
+        port?: number
+      ) => Promise<{ running: boolean; host: string; port: number; error?: string }>
+      apiStop: () => Promise<{ running: boolean; host: string; port: number; error?: string }>
+      apiToggle: (enabled: boolean) => Promise<{
+        running: boolean
+        host: string
+        port: number
+        error?: string
+      }>
     }
   }
 }