chore: remove old scraper scripts, replaced by backend scheduler

Delete scripts/scrape.ts and scripts/scrape-schedule.sh — their
functionality now lives in the backend's node-cron tiered scheduler
(backend/src/services/scheduler.ts + scraper.ts).

Remove scrape and scrape:force npm scripts from package.json.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -7,8 +7,6 @@
     "build": "next build",
     "start": "next start",
     "lint": "next lint",
-    "scrape": "tsx scripts/scrape.ts",
-    "scrape:force": "tsx scripts/scrape.ts --rescrape",
     "debug": "tsx scripts/debug.ts",
     "test": "tsx --test tests/*.test.ts"
   },