feat: Add Supabase configuration and migrations for MC Cars application

- Create Kong declarative configuration for routing and authentication.
- Implement initialization script to set up the database.
- Add SQL migration for initializing roles, schemas, and seeding vehicle data.
- Create leads and customers tables with appropriate policies and functions for CRM.
- Seed admin user and configure storage bucket with RLS policies.

supabase/migrations/00-run-init.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+set -eu
+psql -v ON_ERROR_STOP=1 -v pg_password="$POSTGRES_PASSWORD" --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" -f /sql/01-init.sql