ci(github): add linting and improve CI workflow

- Add ESLint configuration for backend TypeScript code
- Include linting step in backend quality checks
- Add linting step to GitHub Actions CI workflow
- Enable configurable Prisma query logging via PRISMA_LOG_QUERIES environment variable
- Update PrismaService to support dynamic log levels based on PRISMA_LOG_QUERIES
- Replace BadRequestException with UnauthorizedException in receipt import security tests

compose.yml

@@ -18,6 +18,7 @@ services:
       SEED_USER2_PASSWORD: "${SEED_USER2_PASSWORD}"
       IMPORTER_SERVICE_URL: "http://importer-api:3001"
       RECEIPT_TRACE_DECISIONS: "${RECEIPT_TRACE_DECISIONS:-0}"
+      PRISMA_LOG_QUERIES: "${PRISMA_LOG_QUERIES:-0}"
     volumes:
       - recipe_images:/app/recipe-images
     depends_on: