feat: 集成 Battle tab 到 BuddyPanel，重命名 data/ 为 dex/ 规避 gitignore

- BuddyPanel 新增 Battle tab，BattleFlow 加 isActive 控制
- BattleFlow configSelect 阶段支持 ↑↓ 选择物种
- packages/pokemon/src/data/ → dex/，解决根 .gitignore 匹配问题
- 全量 Tab→2空格 缩进转换

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

packages/pokemon/package.json

@@ -7,7 +7,6 @@
   "types": "./src/index.ts",
   "dependencies": {
     "@pkmn/client": "^0.7.2",
-    "@pkmn/protocol": "^0.7.2",
-    "@pkmn/view": "^0.7.2"
+    "@pkmn/protocol": "^0.7.2"
   }
 }