feat(dcauth): 移除机器码，改用纯设备码认证

- DCAuth 协议升级到 v2，签名原文只含设备码；客户端 2.0.0，旧版本返回 426
- 删除客户端机器码采集、后端 machine_code_* 字段与日志、后台机器码展示
- 102 迁移在生产执行前直接改为无机器码结构；SQL 守卫仅放行该文件
- Mock 短信不启用每日限额；修复慢电脑首次启动的协议转发竞态
- 新增 macOS DCAuth.app 打包脚本，注册 dcauth:// 协议，浏览器可直接唤起

apps/dcauth/versioninfo.rc

@@ -1,6 +1,6 @@
 1 VERSIONINFO
-FILEVERSION 1,1,0,0
-PRODUCTVERSION 1,1,0,0
+FILEVERSION 2,0,0,0
+PRODUCTVERSION 2,0,0,0
 FILEFLAGSMASK 0x3fL
 FILEFLAGS 0x0L
 FILEOS 0x40004L
@@ -13,12 +13,12 @@ BEGIN
         BEGIN
             VALUE "CompanyName", "Order Site"
             VALUE "FileDescription", "DCAuth device authentication client"
-            VALUE "FileVersion", "1.1.0.0"
+            VALUE "FileVersion", "2.0.0.0"
             VALUE "InternalName", "DCAuth"
             VALUE "LegalCopyright", "Copyright (C) 2026 Order Site"
             VALUE "OriginalFilename", "DCAuth.exe"
             VALUE "ProductName", "DCAuth"
-            VALUE "ProductVersion", "1.1.0"
+            VALUE "ProductVersion", "2.0.0"
         END
     END
     BLOCK "VarFileInfo"