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>

frontend/src/api/encounters.ts

@@ -1,24 +1,29 @@
 import { api } from './client'
 import type {
-  Encounter,
+  EncounterDetail,
   CreateEncounterInput,
   UpdateEncounterInput,
+  Evolution,
 } from '../types/game'
 
 export function createEncounter(
   runId: number,
   data: CreateEncounterInput,
-): Promise<Encounter> {
+): Promise<EncounterDetail> {
   return api.post(`/runs/${runId}/encounters`, data)
 }
 
 export function updateEncounter(
   id: number,
   data: UpdateEncounterInput,
-): Promise<Encounter> {
+): Promise<EncounterDetail> {
   return api.patch(`/encounters/${id}`, data)
 }
 
 export function deleteEncounter(id: number): Promise<void> {
   return api.del(`/encounters/${id}`)
 }
+
+export function fetchEvolutions(pokemonId: number): Promise<Evolution[]> {
+  return api.get(`/pokemon/${pokemonId}/evolutions`)
+}