Add drag-and-drop boss reordering and new feature beans

Adds boss battle reorder API endpoint with two-phase order update to
avoid unique constraint violations. Includes frontend mutation hook
and API client. Also adds draft beans for progression dividers and
conditional boss battle teams features.

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

frontend/src/api/admin.ts

@@ -23,6 +23,7 @@ import type {
   CreateBossBattleInput,
   UpdateBossBattleInput,
   BossPokemonInput,
+  BossReorderItem,
 } from '../types'
 
 // Games
@@ -123,5 +124,8 @@ export const updateBossBattle = (gameId: number, bossId: number, data: UpdateBos
 export const deleteBossBattle = (gameId: number, bossId: number) =>
   api.del(`/games/${gameId}/bosses/${bossId}`)
 
+export const reorderBosses = (gameId: number, bosses: BossReorderItem[]) =>
+  api.put<BossBattle[]>(`/games/${gameId}/bosses/reorder`, { bosses })
+
 export const setBossTeam = (gameId: number, bossId: number, team: BossPokemonInput[]) =>
   api.put<BossBattle>(`/games/${gameId}/bosses/${bossId}/pokemon`, team)