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/encounters.py

@@ -1,12 +1,19 @@
 from fastapi import APIRouter, Depends, HTTPException, Response
+from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import joinedload
 
 from app.core.database import get_session
 from app.models.encounter import Encounter
 from app.models.nuzlocke_run import NuzlockeRun
 from app.models.pokemon import Pokemon
 from app.models.route import Route
-from app.schemas.encounter import EncounterCreate, EncounterResponse, EncounterUpdate
+from app.schemas.encounter import (
+    EncounterCreate,
+    EncounterDetailResponse,
+    EncounterResponse,
+    EncounterUpdate,
+)
 
 router = APIRouter()
 
@@ -50,7 +57,7 @@ async def create_encounter(
     return encounter
 
 
-@router.patch("/encounters/{encounter_id}", response_model=EncounterResponse)
+@router.patch("/encounters/{encounter_id}", response_model=EncounterDetailResponse)
 async def update_encounter(
     encounter_id: int,
     data: EncounterUpdate,
@@ -65,8 +72,18 @@ async def update_encounter(
         setattr(encounter, field, value)
 
     await session.commit()
-    await session.refresh(encounter)
-    return encounter
+
+    # Reload with relationships for detail response
+    result = await session.execute(
+        select(Encounter)
+        .where(Encounter.id == encounter_id)
+        .options(
+            joinedload(Encounter.pokemon),
+            joinedload(Encounter.current_pokemon),
+            joinedload(Encounter.route),
+        )
+    )
+    return result.scalar_one()
 
 
 @router.delete("/encounters/{encounter_id}", status_code=204)