feat: 新增 /pokemon-battle 独立战斗命令，从 BuddyPanel 移除 Battle tab

- 新增 /pokemon-battle 命令，独立全屏战斗面板
- BattlePanel 在主 app Ink 上下文中使用 useInput，通过 inputRef 转发事件
- BuddyPanel 恢复为 Buddy/Pokédex/Egg 三 tab
- BattleFlow 移除内部 useInput，改为暴露 handleInput 方法

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

src/commands.ts

@@ -155,6 +155,11 @@ const buddy = feature('BUDDY')
       require('./commands/buddy/index.js') as typeof import('./commands/buddy/index.js')
     ).default
   : null
+const pokemonBattle = feature('BUDDY')
+  ? (
+      require('./commands/pokemon-battle/index.js') as typeof import('./commands/pokemon-battle/index.js')
+    ).default
+  : null
 const poor = feature('POOR')
   ? (
       require('./commands/poor/index.js') as typeof import('./commands/poor/index.js')
@@ -364,6 +369,7 @@ const COMMANDS = memoize((): Command[] => [
   ...(webCmd ? [webCmd] : []),
   ...(forkCmd ? [forkCmd] : []),
   ...(buddy ? [buddy] : []),
+  ...(pokemonBattle ? [pokemonBattle] : []),
   ...(poor ? [poor] : []),
   ...(proactive ? [proactive] : []),
   ...(monitorCmd ? [monitorCmd] : []),