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/items.ts

@@ -0,0 +1,138 @@
+/**
+ * Queries de itens unificados
+ * Busca itens da tabela unificada items (PostgreSQL)
+ */
+
+import { query } from "../index";
+
+export interface UnifiedItem {
+  item_id: number;
+  source_table_id: number;
+  source_table_name: string;
+  item_name: string;
+  category: string;
+  image_local_path: string | null;
+  image_url: string | null;
+  rarity: string | null;
+  level: number | null;
+  weight: number | null;
+  slots: number | null;
+  skill: string | null;
+  metadata: any; // JSONB
+  created_at: Date;
+  updated_at: Date;
+}
+
+/**
+ * Busca item por ID unificado
+ */
+export async function getItemByIdUnified(itemId: number): Promise<UnifiedItem | null> {
+  try {
+    const result = await query<UnifiedItem>(
+      `
+      SELECT 
+        item_id,
+        source_table_id,
+        source_table_name,
+        item_name,
+        category,
+        image_local_path,
+        image_url,
+        rarity,
+        level,
+        weight,
+        slots,
+        skill,
+        metadata,
+        created_at,
+        updated_at
+      FROM items
+      WHERE item_id = $1
+      `,
+      [itemId]
+    );
+
+    if (result.rows.length === 0) {
+      return null;
+    }
+
+    return result.rows[0];
+  } catch (error: any) {
+    // Se a tabela não existe (código 42P01), retornar null silenciosamente
+    // Isso permite fallback para SQLite sem poluir logs
+    if (error?.code === "42P01") {
+      return null;
+    }
+    // Para outros erros, re-lançar
+    throw error;
+  }
+}
+
+/**
+ * Busca item por nome (case-insensitive)
+ */
+export async function getItemByNameUnified(itemName: string): Promise<UnifiedItem | null> {
+  try {
+    const result = await query<UnifiedItem>(
+      `
+      SELECT 
+        item_id,
+        source_table_id,
+        source_table_name,
+        item_name,
+        category,
+        image_local_path,
+        image_url,
+        rarity,
+        level,
+        weight,
+        slots,
+        skill,
+        metadata,
+        created_at,
+        updated_at
+      FROM items
+      WHERE LOWER(item_name) = LOWER($1)
+      LIMIT 1
+      `,
+      [itemName]
+    );
+
+    if (result.rows.length === 0) {
+      return null;
+    }
+
+    return result.rows[0];
+  } catch (error: any) {
+    // Se a tabela não existe (código 42P01), retornar null silenciosamente
+    if (error?.code === "42P01") {
+      return null;
+    }
+    throw error;
+  }
+}
+
+/**
+ * Valida se um item existe na tabela unificada
+ */
+export async function itemExists(itemId: number): Promise<boolean> {
+  try {
+    const result = await query<{ exists: boolean }>(
+      `
+      SELECT EXISTS(
+        SELECT 1 FROM items WHERE item_id = $1
+      ) as exists
+      `,
+      [itemId]
+    );
+
+    return result.rows[0]?.exists || false;
+  } catch (error: any) {
+    // Se a tabela não existe (código 42P01), retornar false silenciosamente
+    if (error?.code === "42P01") {
+      return false;
+    }
+    throw error;
+  }
+}
+