Remove Wire.API.User.Phone module and phone-related dead code

[Copilot]

Description

Phone functionality was deprecated - endpoints return errors, DB columns dropped in V82/V84. This removes the module and associated dead code while preserving backward compatibility.

Removed:

• Wire.API.User.Phone module
• PhoneUpdate, SendLoginCode types and error variants
• Endpoints: change-phone, remove-phone, send-login-code (all stub handlers)
• Golden tests and test data (43 files)

Retained:

• Minimal Phone type moved inline to Wire.API.User.Identity
• Used only for deserializing old data in UserEvents, EJPD, and password reset
• All usages are read-only (phone fields always Nothing)

Additional dead code identified:

• tools/db/phone-users/ - queries phone-only users, but phone columns no longer exist

Checklist

• Add a new entry in an appropriate subdirectory of changelog.d
• Read and follow the PR guidelines

Original prompt

there is a module Wire.API.User.Phone in this repo, and there shouldn't. please remove it and see if you can find any other dead code around phone numbers.

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