refactor: update schema.sql to match live DB

Replace old scripts with a single definitive schema.sql file.

Co-authored-by: Moheeb Zara <[email protected]>

scripts/013_add_last_paid_at.sql

@@ -0,0 +1,10 @@
+-- =============================================================================
+-- Migration 013: Add space_members.last_paid_at
+-- =============================================================================
+-- Adds last_paid_at column to space_members.
+-- This column is written by importMembers() and linkPaymentToMember() in
+-- lib/actions.ts. The column last_payment_at already existed as a legacy
+-- field; last_paid_at is the canonical name used by the application code.
+-- =============================================================================
+
+ALTER TABLE public.space_members ADD COLUMN IF NOT EXISTS last_paid_at timestamptz;