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>

src/screens/REPL.tsx

@@ -3462,7 +3462,7 @@ export function REPL({
             updateDailyStats: _updateDaily,
             incrementTurns: _incTurns,
           } = await import('@claude-code-best/pokemon');
-          const _data = _updateDaily(_incTurns(_load()));
+          const _data = _updateDaily(_incTurns(await _load()));
           const _creature = _getActive(_data);
           if (_creature) {
             // 1. Collect tool names from this turn's messages
@@ -3502,7 +3502,7 @@ export function REPL({
               _data.eggs = _data.eggs.map((e: any) => _advSteps(e, 3));
               const _readyEgg = _data.eggs.find(_isReady);
               if (_readyEgg) {
-                const { buddyData: _hatched, creature: _newC } = _hatchEgg(_data, _readyEgg);
+                const { buddyData: _hatched, creature: _newC } = await _hatchEgg(_data, _readyEgg);
                 Object.assign(_data, _hatched);
               }
             }