- Add CardDefinition and CardInstance models for card templates and in-game state
- Add Attack, Ability, and WeaknessResistance models for Pokemon card components
- Add 11 action types as discriminated union (PlayPokemon, Evolve, Attack, etc.)
- Split PokemonStage (BASIC, STAGE_1, STAGE_2) from PokemonVariant (NORMAL, EX, GX, V, VMAX, VSTAR)
- Stage determines evolution mechanics, variant determines knockout points
- Update PrizeConfig to use variant for knockout point calculation
- VSTAR and VMAX both worth 3 points; EX, GX, V worth 2 points; NORMAL worth 1 point
Tests: 204 passing, all linting clean
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