feat(db): migrate api to d1

[risu729]

Summary

• migrate the API and Drizzle schema from Supabase/Postgres/PostGIS to Cloudflare D1
• remove geospatial DB usage and use numeric lat/lng radius calculations in API code
• add D1 schema/reset/migration files, bind DB in Wrangler, and apply D1 migrations in deploy workflow
• remove Supabase secrets/docs and update DB setup docs for D1

D1

• created jematala-db in Cloudflare D1
• database ID: 816d5f5d-0be0-4122-88a9-f4bcee86892e
• applied 0001_initial.sql to the remote D1 database

Verification

• bun run check
• bun run build:api
• bun run --cwd packages/db reset:local
• local D1 smoke query: 6 POIs, 32 level quests; rotation SQL inserts 5 active POIs
• remote D1 smoke query: 6 POIs, 32 level quests, 5 active daily quest rows

Notes

• The CLOUDFLARE_API_TOKEN in the main worktree .env did not have D1 permissions, so I used existing Wrangler auth after sourcing the account ID. CI CLOUDFLARE_API_TOKEN needs D1 migration permissions for the new deploy step.