fix: lowercase card ID when matching PokeWallet rarities

TCGdex JA uses uppercase set codes (SV9-001) while PokeWallet map
keys are lowercase (sv9-1). Normalize to lowercase for matching.

Author: Pyronewbic

lib/cards/card-database.js

@@ -398,7 +398,7 @@ async function enrichWithPokewalletRarities(index) {
   let enriched = 0;
   for (const card of index) {
     if (card.rarity) continue;
-    const normId = normalizeCardId(card.id);
+    const normId = normalizeCardId(card.id).toLowerCase();
     const rarity = pwRarities.get(normId);
     if (rarity) {
       card.rarity = rarity;