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/api/genlockes.ts

@@ -0,0 +1,10 @@
+import { api } from './client'
+import type { Genlocke, CreateGenlockeInput, Region } from '../types/game'
+
+export function createGenlocke(data: CreateGenlockeInput): Promise<Genlocke> {
+  return api.post('/genlockes', data)
+}
+
+export function getGamesByRegion(): Promise<Region[]> {
+  return api.get('/games/by-region')
+}