fix(ios): refuse MySQL connections that use a Mac socket

[datlechin]

Why

#3315 lets a MySQL or MariaDB connection on the Mac dial a local socket, saved in additionalFields as localSocketPath. Connections sync to iPhone and iPad, where that socket does not exist. The iOS driver ignored the key and connected by host and port instead, usually localhost, which reaches the wrong server or fails with an unrelated error.

Change

• iPhone and iPad refuse a MySQL, MariaDB, TiDB or OceanBase connection that dials a Mac socket, before any network attempt: "This connection uses a socket on a Mac and cannot be opened on iPhone or iPad."
• An SSH tunnel still wins over the socket, the same rule the Mac follows.
• The key is never dropped or rewritten, so the connection syncs back unchanged, also after an edit on iOS.
• iOS compiles the plugin's MySQLLocalSocket.swift, so both apps read the key with one rule. The iOS docs list it under What is missing.

Verified

MySQLVariantSupportTests refusal cases fail on main and pass here; ConnectionErrorClassifierTests and ConnectionFormEditsTests cover the message and the edit path.

Not in this PR

• No CHANGELOG entry: socket connections are unreleased, so this folds into that feature's entry.
• The iOS connection list still shows host and port for a socket connection.

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