real Supabase schema + data loaded; cleanup synthesized placeholder

Major changes:
- Drop synthesized base schema (supabase/synthesized/000_base_schema.sql) —
  real pg_dump from Supabase is now the source of truth
- Switch better-auth from better-auth/minimal to better-auth (full)
- Add localhost:9000 (MinIO) to next.config images allowlist
- Add .data/, bin/ to gitignore (local runtime artifacts)
- Ignore supabase/captured/ (regenerate from Supabase as needed)

DB state after dump:
- 65 real tables (vs 70 synthesized)
- 252 functions
- 5 brands: Tuxedo Corn, Indian River Direct + 3 test brands
- 3 admin users, 1 communication template, 7 brand features

Pooler URL: aws-1-us-east-1.pooler.supabase.com:5432
  user: postgres.wnzkhezyhnfzhkhiflrp
  (NOT aws-0 — that one doesn't know this project)

.gitignore

@@ -44,3 +44,17 @@ supabase/.temp/
 
 # Docker / self-hosted Postgres
 db_data/
+
+# Captured Supabase data (re-pull from Supabase as needed)
+supabase/captured/captured_data.sql.gz
+supabase/captured/captured_schema.sql
+
+# Local data and binaries
+.data/
+bin/postgrest
+bin/minio
+bin/mc
+bin/postgrest-proxy.js
+bin/postgrest.tar.xz
+# Captured Supabase dump (regenerate from Supabase with the guide in docs/SUPABASE_DUMP_GUIDE.md)
+supabase/captured/