refactor(domain): migrate TeamSeasonRecord to LoL (remove draws)

[NicoRuedaA]

Problem or opportunity

TeamSeasonRecord in domain/src/team.rs contains football-specific concepts that do not exist in League of Legends:

• drawn: u32 — LoL has no draws (series are Bo1/Bo3/Bo5 with clear winner)
• goals_for: u32 — should be maps_won
• goals_against: u32 — should be maps_lost

Proposed solution

1. Remove drawn field entirely.
2. Rename goals_for → maps_won.
3. Rename goals_against → maps_lost.
4. Add serde aliases for backwards compatibility.

UX impact

• Standings table currently shows draws and goals — must switch to maps won/lost.
• Season review screen affected.

Acceptance criteria

• drawn field removed from TeamSeasonRecord
• goals_for renamed to maps_won with alias
• goals_against renamed to maps_lost with alias
• UI updated to show maps instead of goals/draws
• Standings calculation updated (no draw points)

Scope

Data / provenance

[NicoRuedaA]

PR: #68