refactor(domain): migrate PlayerSeasonStats to LoL terminology

[NicoRuedaA]

Problem or opportunity

PlayerSeasonStats in domain/src/player.rs still uses football terminology for season statistics:

• goals → should be kills
• shots → should be creep_score
• shots_on_target → should be deaths
• passes_completed → should be �ision_score
• passes_attempted → should be wards_placed
• ackles_won → should be damage_dealt
• interceptions → should be wards_destroyed
• clean_sheets → should be shutouts
• minutes_played → should be games_played

Note: player_match_stats table already has LoL columns (v020), but the season aggregate stats struct was never updated.

Proposed solution

Rename fields in PlayerSeasonStats struct to use LoL terminology. Add #[serde(alias = "old_name")] for each renamed field to maintain backwards compatibility with existing saves.

UX impact

• UI displaying season stats will show correct LoL terminology.
• Player profile and standings screens affected.

Acceptance criteria

• All fields in PlayerSeasonStats use LoL terminology
• Serde aliases exist for every renamed field
• UI labels updated to match new field names
• Existing saves load without data loss
• Tests updated to use new field names

Scope

Data / provenance