feat: implement market page with QueryProvider and dynamic listings

- wrap root layout with QueryProvider for React Query
- replace market UnderConstruction placeholder with MarketClient and real data fetching
- implement search, pagination, and sort via search params using getActiveListings
- add necessary client components and queries
- update dependencies (e.g., prisma, pkg-types)

lib/db/queries/characters.ts

@@ -92,6 +92,27 @@ export async function getUserCharacters(userId: number): Promise<Character[]> {
   return result.rows;
 }
 
+/**
+ * Busca personagem principal de um usuário em um servidor específico
+ * Retorna o personagem principal (is_main = true) ou o primeiro personagem do servidor
+ */
+export async function getMainCharacterByUserId(
+  userId: number,
+  serverName: string
+): Promise<Character | null> {
+  const result = await query<Character>(
+    `
+    SELECT * FROM user_characters 
+    WHERE user_id = $1 AND server_name = $2
+    ORDER BY is_main DESC, created_at ASC
+    LIMIT 1
+    `,
+    [userId, serverName]
+  );
+
+  return result.rows[0] || null;
+}
+
 /**
  * Busca personagem por ID
  */