feat: Phase 1 — 数据模型升级 Creature v2 + PCBox/Bag

- 新增 MoveSlot, PCBox, Bag, ItemId 类型
- Creature 扩展 nature/moves/ability/heldItem/pokeball 字段
- BuddyData 升级 v2: 新增 boxes, bag, battlesWon/battlesLost
- 新建 data/learnsets.ts: getDefaultMoveset/getDefaultAbility/getNewLearnableMoves
- storage.ts v1→v2 迁移: 回填 nature/moves/ability，新增 PCBox/Bag
- 新增 PCBox 操作: deposit/withdraw/move/rename/findLocation/release
- 新增 Bag 操作: add/remove/getCount
- generateCreature/loadBuddyData/hatchEgg 改为 async (Dex.learnsets.get 异步)
- 修复 PokedexView: activeCreatureId → party[0]
- 更新测试文件: async/await + v2 BuddyData fixtures

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

packages/pokemon/src/ui/PokedexView.tsx

@@ -55,8 +55,8 @@ export function PokedexView({ buddyData }: PokedexViewProps) {
 						const species = getSpeciesData(speciesId)
 						const entry = dexMap.get(speciesId)
 						const discovered = !!entry
-						const isActive = buddyData.activeCreatureId
-							? buddyData.creatures.some((c) => c.id === buddyData.activeCreatureId && c.speciesId === speciesId)
+						const isActive = buddyData.party[0]
+							? buddyData.creatures.some((c) => c.id === buddyData.party[0] && c.speciesId === speciesId)
 							: false
 						const nextEvo = getNextEvolution(speciesId)