Add pokemon evolution support across the full stack

- Evolution model with trigger, level, item, and condition fields
- Encounter.current_pokemon_id tracks evolved species separately
- Alembic migration for evolutions table and current_pokemon_id column
- Seed pipeline loads evolution data with manual overrides
- GET /pokemon/{id}/evolutions and PATCH /encounters/{id} endpoints
- Evolve button in StatusChangeModal with evolution method details
- PokemonCard shows evolved species with "Originally" label

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/app/api/runs.py

@@ -51,6 +51,8 @@ async def get_run(run_id: int, session: AsyncSession = Depends(get_session)):
             selectinload(NuzlockeRun.encounters)
             .joinedload(Encounter.pokemon),
             selectinload(NuzlockeRun.encounters)
+            .joinedload(Encounter.current_pokemon),
+            selectinload(NuzlockeRun.encounters)
             .joinedload(Encounter.route),
         )
     )