- Create config/scraper.js with all scraper constants
- Add TARGET_URL for apartment listing page
- Add SCRAPER_SCHEDULE, SCRAPER_TIMEZONE, SCRAPER_ENABLED settings
- Add SCRAPER_TIMEOUT and USER_AGENT settings
- Add RETRY_CONFIG with maxRetries, baseDelay, timeout
- Add COLLECTIONS object with env var overrides for all 4 collections
- Create comprehensive test suite with 25 test cases