Add genlocke cumulative graveyard with backend endpoint and UI

Aggregates all fainted encounters across every leg of a genlocke into a
unified graveyard view. Backend serves GET /genlockes/{id}/graveyard with
per-entry leg/game context and summary stats (total deaths, deaths per
leg, deadliest leg). Frontend adds a toggle button on the genlocke detail
page that reveals a filterable/sortable grid of grayscale Pokemon cards.

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

frontend/src/types/game.ts

@@ -284,3 +284,32 @@ export interface GenlockeDetail {
   stats: GenlockeStats
   retiredPokemon: Record<number, RetiredPokemon>
 }
+
+// Graveyard types
+
+export interface GraveyardEntry {
+  id: number
+  pokemon: Pokemon
+  currentPokemon: Pokemon | null
+  nickname: string | null
+  catchLevel: number | null
+  faintLevel: number | null
+  deathCause: string | null
+  isShiny: boolean
+  routeName: string
+  legOrder: number
+  gameName: string
+}
+
+export interface GraveyardLegSummary {
+  legOrder: number
+  gameName: string
+  deathCount: number
+}
+
+export interface GenlockeGraveyard {
+  entries: GraveyardEntry[]
+  totalDeaths: number
+  deathsPerLeg: GraveyardLegSummary[]
+  deadliestLeg: GraveyardLegSummary | null
+}