Add genlocke creation wizard with backend API and 4-step frontend

Implements the genlocke creation feature end-to-end: Genlocke and
GenlockeLeg models with migration, POST /genlockes endpoint that
creates the genlocke with all legs and auto-starts the first run,
and a 4-step wizard UI (Name, Select Games with preset templates,
Rules, Confirm) at /genlockes/new.

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

frontend/src/types/game.ts

@@ -193,3 +193,34 @@ export interface CreateBossResultInput {
 // Re-export for convenience
 import type { NuzlockeRules } from './rules'
 export type { NuzlockeRules }
+
+// Genlocke types
+export interface GenlockeRules {
+  retireHoF: boolean
+}
+
+export interface GenlockeLeg {
+  id: number
+  genlockeId: number
+  gameId: number
+  runId: number | null
+  legOrder: number
+  game: Game
+}
+
+export interface Genlocke {
+  id: number
+  name: string
+  status: 'active' | 'completed' | 'failed'
+  genlockeRules: GenlockeRules
+  nuzlockeRules: NuzlockeRules
+  createdAt: string
+  legs: GenlockeLeg[]
+}
+
+export interface CreateGenlockeInput {
+  name: string
+  gameIds: number[]
+  genlockeRules: GenlockeRules
+  nuzlockeRules: NuzlockeRules
+}