feat: add search and filter controls to invoice list

backend/src/invoices/invoices.controller.ts

@@ -43,11 +43,13 @@ export class InvoicesController {
     @CurrentUser() user: User,
     @Query("page") page?: string,
     @Query("limit") limit?: string,
+    @Query("search") search?: string,
+    @Query("status") status?: string,
   ): Promise<Invoice[]> {
     const p = page ? parseInt(page, 10) : 1;
     const l = limit ? parseInt(limit, 10) : 20;
     const result = await this.prisma.runWithMerchantScope(user.merchantId, () =>
-      this.invoicesService.findAll(user.merchantId, p, l),
+      this.invoicesService.findAll(user.merchantId, p, l, search, status),
     );
     return result.items;
   }

backend/src/invoices/invoices.service.ts

@@ -51,6 +51,8 @@ export class InvoicesService implements OnModuleInit {
     merchantId: string,
     page = 1,
     limit = 20,
+    search?: string,
+    status?: string,
   ): Promise<{
     items: Invoice[];
     total: number;
@@ -59,14 +61,32 @@ export class InvoicesService implements OnModuleInit {
     hasMore: boolean;
   }> {
     const skip = (page - 1) * limit;
+
+    // Build where clause from filters
+    const where: Record<string, unknown> = { merchantId };
+
+    if (search && search.trim().length > 0) {
+      const term = search.trim();
+      where["OR"] = [
+        { invoiceNumber: { contains: term, mode: "insensitive" } },
+        { clientName: { contains: term, mode: "insensitive" } },
+        { clientEmail: { contains: term, mode: "insensitive" } },
+        { memo: { contains: term, mode: "insensitive" } },
+      ];
+    }
+
+    if (status && status.trim().length > 0) {
+      where["status"] = status;
+    }
+
     const [items, total] = await Promise.all([
       this.prisma.invoice.findMany({
-        where: { merchantId },
+        where,
         skip,
         take: limit,
         orderBy: { createdAt: "desc" },
       }),
-      this.prisma.invoice.count({ where: { merchantId } }),
+      this.prisma.invoice.count({ where }),
     ]);
 
     const normalizedItems = items.map((inv) => this.normalizeInvoice(inv));