Add type restriction rule (monolocke)

Adds allowedTypes: string[] to NuzlockeRules. When set, the encounter
selector hides non-matching Pokemon and the routes endpoint filters out
routes with no matching encounters, so only eligible locations appear.

Type picker UI in RulesConfiguration; active restriction shown in
RuleBadges. Backend accepts allowed_types query param and joins through
RouteEncounter.pokemon to filter by type.

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

frontend/src/api/games.ts

@@ -13,10 +13,12 @@ export function getGame(id: number): Promise<GameDetail> {
   return api.get(`/games/${id}`)
 }
 
-export function getGameRoutes(gameId: number): Promise<Route[]> {
+export function getGameRoutes(gameId: number, allowedTypes?: string[]): Promise<Route[]> {
   // Use flat=true to get all routes in a flat list
   // The frontend organizes them into hierarchy based on parentRouteId
-  return api.get(`/games/${gameId}/routes?flat=true`)
+  const params = new URLSearchParams({ flat: 'true' })
+  for (const t of allowedTypes ?? []) params.append('allowed_types', t)
+  return api.get(`/games/${gameId}/routes?${params}`)
 }
 
 export function getRoutePokemon(routeId: number, gameId?: number): Promise<RouteEncounterDetail[]> {