Remove the vendored RethinkDb driver and its Linq provider, the Rethink
backing store, the already-stubbed RethinkConnection, the Rethink test
window, and the Rethink-only Remotion.Linq and Logging.Abstractions DLLs.
The database editor now works only on GameData/AetherDB.msgpack, with a
Save button replacing the dead Connect UI and broken JSON export.
RethinkTable becomes DatabaseCategory, which only groups editor entries.
Economy.Server still references Rethink; it was already unbuildable and
is handled separately.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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