Add Hall of Fame team selection for completed runs

After marking a run as completed, a modal prompts the player to select
which Pokemon (up to 6) entered the Hall of Fame. The selection is stored
as hof_encounter_ids on the run, displayed in the victory banner, and
can be edited later. This lays the foundation for scoping genlocke
retireHoF to only the actual HoF team.

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

frontend/src/types/game.ts

@@ -89,6 +89,7 @@ export interface NuzlockeRun {
   name: string
   status: RunStatus
   rules: NuzlockeRules
+  hofEncounterIds: number[] | null
   startedAt: string
   completedAt: string | null
 }
@@ -136,6 +137,7 @@ export interface UpdateRunInput {
   name?: string
   status?: RunStatus
   rules?: NuzlockeRules
+  hofEncounterIds?: number[]
 }
 
 export interface CreateEncounterInput {