Simplify data model

[chengh42]

Description

Cleans up the data model before backfilling data:

• Season: removes id (int PK), is_active, is_published, published_at — name (e.g. 2025-2026) is now the PK, enforced by a Pydantic validator and a Postgres CHECK constraint in the migration
• Teams: removes the unused Team ORM model and teams DB table; team data is hardcoded in app/services/teams.py (TeamInfo). Renamed is_nbb → use_nbb_ref, needs_tafel3 → use_24s. Added team_id (foys.io ID) per team. Renamed team_mapping.py → teams.py
• Game → Match: renamed Game ORM model to Match, DB table games → matches, join table game_timeslots → match_timeslots. API routes updated: /seasons/{name}/games → /seasons/{name}/matches. SyncLog columns games_added/updated/removed → matches_added/updated/removed
• match_id non-null: matches.match_id is now NOT NULL — all rows come from foys.io and always have an ID
• All FK columns referencing seasons.id (int) updated to reference seasons.name (string)
• Route path params updated from season_id: int to season_name: str

Jira / Figma / Other References

N/A

Manual Testing Plan & New UI Screenshots:

All 43 existing tests pass. No manual testing needed — changes are model/schema only with no new behaviour.

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Project	Deployment	Actions	Updated (UTC)
usbasketball-taken	Ready	Preview, Comment	Apr 14, 2026 8:55pm