feat: implement receipt alias functionality with CRUD operations and integrate with receipt import

backend/src/receipt-alias/dto/create-receipt-alias.dto.ts

@@ -0,0 +1,10 @@
+import { IsInt, IsString, MinLength } from 'class-validator';
+
+export class CreateReceiptAliasDto {
+  @IsString()
+  @MinLength(1)
+  receiptName!: string;
+
+  @IsInt()
+  productId!: number;
+}

backend/src/receipt-alias/receipt-alias.controller.ts

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+import { Body, Controller, Delete, Get, Param, ParseIntPipe, Post } from '@nestjs/common';
+import { ReceiptAliasService } from './receipt-alias.service';
+import { CreateReceiptAliasDto } from './dto/create-receipt-alias.dto';
+
+@Controller('receipt-aliases')
+export class ReceiptAliasController {
+  constructor(private readonly receiptAliasService: ReceiptAliasService) {}
+
+  @Get()
+  findAll() {
+    return this.receiptAliasService.findAll();
+  }
+
+  @Post()
+  upsert(@Body() dto: CreateReceiptAliasDto) {
+    return this.receiptAliasService.upsert(dto);
+  }
+
+  @Delete(':id')
+  remove(@Param('id', ParseIntPipe) id: number) {
+    return this.receiptAliasService.remove(id);
+  }
+}

backend/src/receipt-alias/receipt-alias.module.ts

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+import { Module } from '@nestjs/common';
+import { ReceiptAliasController } from './receipt-alias.controller';
+import { ReceiptAliasService } from './receipt-alias.service';
+import { PrismaModule } from '../prisma/prisma.module';
+
+@Module({
+  imports: [PrismaModule],
+  controllers: [ReceiptAliasController],
+  providers: [ReceiptAliasService],
+  exports: [ReceiptAliasService],
+})
+export class ReceiptAliasModule {}

backend/src/receipt-alias/receipt-alias.service.ts

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+import { Injectable } from '@nestjs/common';
+import { PrismaService } from '../prisma/prisma.service';
+import { CreateReceiptAliasDto } from './dto/create-receipt-alias.dto';
+
+@Injectable()
+export class ReceiptAliasService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  findAll() {
+    return this.prisma.receiptAlias.findMany({
+      include: { product: { select: { id: true, name: true, canonicalName: true } } },
+      orderBy: { receiptName: 'asc' },
+    });
+  }
+
+  async upsert(dto: CreateReceiptAliasDto) {
+    const normalized = dto.receiptName.toLowerCase().trim();
+    return this.prisma.receiptAlias.upsert({
+      where: { receiptName: normalized },
+      create: { receiptName: normalized, productId: dto.productId },
+      update: { productId: dto.productId },
+    });
+  }
+
+  remove(id: number) {
+    return this.prisma.receiptAlias.delete({ where: { id } });
+  }
+}