Folderize QueenZone.Data root DTO/model types by domain

[richardorchard]

Agent

Agent: Cursor Composer

Summary

• Moved 111 root DTO/read-model files in QueenZone.Data into domain folders (Articles/, Biography/, Discography/, Forum/, FreddieTribute/, History/, Links/, Members/, News/, Photos/, Search/, Shared/).
• Left namespaces as QueenZone.Data (folder-only moves) to avoid solution-wide churn.
• Kept infrastructure at the project root: QueenZoneDbContext, factory, DI extensions, and SQL Server options.
• No behavior changes; oversized repository splits left as optional follow-ups per the issue.

Testing

• dotnet restore QueenZone.sln
• dotnet build QueenZone.sln --configuration Release --no-restore
• dotnet format QueenZone.sln --verify-no-changes
• dotnet test QueenZone.sln --configuration Release --no-build (2054 passed)
• Coverage gate N/A locally for this change (rename-only; 0 insertions/deletions vs origin/main)
• Route/page tests avoid brittle CSS class or exact markup assertions unless markup shape is the contract
• If this PR touches EF migrations / QueenZoneDbContext / Entities/: not applicable

Legacy database checks

• Not required for this change
• Ran with RUN_LEGACY_DB_TESTS=true
• Skipped (explain below)

Issues

Closes #593
Relates to #580

Follow-up

Optional later PRs (called out in #593): split oversized repositories such as EfPrivateMessageRepository / EfNewsDiscoveryRepository when next edited.

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