Switch the tennis simulator's Elo source from the per-window table
to the canonical participant_surface_elos via season_participants.participant_id.
Map key stays season_participant.id so the simulator's call pattern is unchanged.
Other functions in this file still read/write the per-window table
(seasonParticipantSurfaceElos). They back the old admin surface-elo page
and are removed in Phase 4 after the canonical admin flow replaces them.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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