Fix seeder: skip heavy devDeps, decouple app from seeder success

- Use npm ci --omit=dev to avoid building sharp (needs native libvips
  not available on Alpine) then install tsx separately
- Change app depends_on from seeder (service_completed_successfully)
  to relay only, so the app still starts even if seeding fails

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.yml

@@ -10,8 +10,7 @@ services:
     ports:
       - "7777:7777"
     depends_on:
-      seeder:
-        condition: service_completed_successfully
+      - relay
     networks:
       - indeedhub-network
     labels: