chore: add flyer import module and configuration

- Added FlyerImportModule to AppModule imports
- Created new flyer-import module directory
- Added .kilo/ configuration directory

backend/src/flyer-import/flyer-import.controller.ts

@@ -0,0 +1,59 @@
+import {
+  BadRequestException,
+  Controller,
+  HttpCode,
+  Post,
+  Request,
+  UploadedFile,
+  UseInterceptors,
+} from '@nestjs/common';
+import { Throttle } from '@nestjs/throttler';
+import { FileInterceptor } from '@nestjs/platform-express';
+import { memoryStorage } from 'multer';
+import { FlyerImportResponse } from './dto/flyer-import.response';
+import { FlyerImportService } from './flyer-import.service';
+
+const ALLOWED_MIMES = [
+  'application/pdf',
+  'application/octet-stream',
+  'text/plain',
+];
+
+@Controller('flyer-import')
+export class FlyerImportController {
+  constructor(private readonly flyerImportService: FlyerImportService) {}
+
+  @Post('parse')
+  @HttpCode(200)
+  @Throttle({ default: { ttl: 60_000, limit: 10 } })
+  @UseInterceptors(
+    FileInterceptor('file', {
+      storage: memoryStorage(),
+      limits: { fileSize: 15 * 1024 * 1024 },
+    }),
+  )
+  async parseFlyer(
+    @UploadedFile() file?: Express.Multer.File,
+    @Request() req?: any,
+  ): Promise<FlyerImportResponse> {
+    if (!file?.buffer) {
+      throw new BadRequestException('Ingen fil skickades med.');
+    }
+    if (!ALLOWED_MIMES.includes(file.mimetype)) {
+      throw new BadRequestException('Otillåten filtyp. Använd PDF eller textfil.');
+    }
+
+    const userId =
+      typeof req?.user?.id === 'number'
+        ? req.user.id
+        : typeof req?.user?.userId === 'number'
+          ? req.user.userId
+          : undefined;
+
+    if (!userId) {
+      throw new BadRequestException('Kunde inte identifiera användaren.');
+    }
+
+    return this.flyerImportService.parseAndMatch(file, userId);
+  }
+}