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/hooks/useGames.ts

@@ -15,10 +15,10 @@ export function useGame(id: number) {
   })
 }
 
-export function useGameRoutes(gameId: number | null) {
+export function useGameRoutes(gameId: number | null, allowedTypes?: string[]) {
   return useQuery({
-    queryKey: ['games', gameId, 'routes'],
-    queryFn: () => getGameRoutes(gameId!),
+    queryKey: ['games', gameId, 'routes', allowedTypes],
+    queryFn: () => getGameRoutes(gameId!, allowedTypes),
     enabled: gameId !== null,
   })
 }