docs: add Tailscale MySQL middleware guide

cai

2026-07-02 758dafeab0836ad6a8959bb3fefcdcaeb69a67d8

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Select-String : Â·¾¶ÖоßÓзǷ¨×Ö·û¡£
ËùÔÚλÖàD:\manage_system\scripts\ds_minute_backfill.ps1:15 ×Ö·û: 32
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    + CategoryInfo          : NotSpecified: (:) [Select-String], ArgumentException
    + FullyQualifiedErrorId : System.ArgumentException,Microsoft.PowerShell.Commands.SelectStringCommand