feat: remove dev_session, add Drizzle schema + RLS + real auth

BREAKING: dev_session cookie bypass removed. Admin access now requires
a real Auth.js v5 session (Google OAuth in production). Provision users
by inserting into users + tenant_users tables.

New in this commit:
- db/migrations/0001_init.sql: 18-table SaaS schema with RLS (tenants,
  users, tenant_users, plans, add_ons, subscriptions, tenant_add_ons,
  products, product_images, stops, customers, orders, order_items,
  brand_settings, email_templates, campaigns, files, audit_log)
- db/schema/: Drizzle TypeScript mirror of every table
- db/client.ts: withTenant() / withPlatformAdmin() query wrappers that
  set Postgres GUCs (app.current_tenant_id, app.platform_admin) for
  RLS enforcement. Never query a tenant-scoped table without one.
- db/seed.ts: seeds 3 plans, 6 add-ons, 2 tenants (Tuxedo, Indian River
  Direct), brand_settings, sample products/stops/customers
- scripts/migrate.js: applies migrations in lexical order with tracking
- scripts/db-reset.js: drops + recreates DB, runs migrate + seed
- DATABASE_URL now uses rc_app (non-superuser, NOBYPASSRLS). RLS is
  enforced even for the app user. DATABASE_ADMIN_URL for migrations.
- src/lib/admin-permissions.ts: getAdminUser() reads Auth.js session,
  looks up user + tenant in Postgres. brand_id kept as alias for
  backward compat.
- src/middleware.ts: Auth.js-only route protection, dev_session gone
- src/app/login/LoginClient.tsx: Google OAuth only, no demo mode
- src/components/admin/AdminSidebar.tsx + AdminHeader.tsx: signOutAction
  replaces supabase signout
- @/db/* path aliases in tsconfig.json + vitest.config.ts
- drizzle.config.ts added
- db/auth_schema.sql removed (was a stub; replaced by real schema)
- src/app/api/dev-login/route.ts deleted
- tests: updated to remove dev_session coverage

scripts/db-reset.js

@@ -0,0 +1,44 @@
+#!/usr/bin/env node
+/**
+ * DESTRUCTIVE: drops and recreates the `route_commerce` database, then
+ * applies all migrations and seeds.
+ *
+ * Usage:
+ *   npm run db:reset
+ *
+ * Use only in dev. Requires sudo-less access to a postgres superuser.
+ */
+require("dotenv").config({ path: ".env.local" });
+const { execSync } = require("node:child_process");
+const url = process.env.DATABASE_URL;
+if (!url) {
+  console.error("❌ DATABASE_URL is not set");
+  process.exit(1);
+}
+
+const m = url.match(/postgres(?:ql)?:\/\/([^:]+):[^@]+@([^:]+):(\d+)\/(.+)/);
+if (!m) {
+  console.error("❌ Could not parse DATABASE_URL");
+  process.exit(1);
+}
+const [, user, host, port, db] = m;
+const adminUrl = url.replace(/\/[^/]+$/, "/postgres");
+
+console.log(`⚠️  DROPPING and recreating ${db} on ${host}:${port} as ${user}`);
+try {
+  execSync(
+    `psql "${adminUrl}" -c "DROP DATABASE IF EXISTS ${db};" -c "CREATE DATABASE ${db} OWNER ${user};"`,
+    { stdio: "inherit" },
+  );
+  console.log("✓ Database recreated");
+} catch (err) {
+  console.error("❌ Failed to drop/create database. Try with sudo:");
+  console.error(
+    `   sudo -u postgres psql -c "DROP DATABASE IF EXISTS ${db};" -c "CREATE DATABASE ${db} OWNER ${user};"`,
+  );
+  process.exit(1);
+}
+
+execSync("npm run db:migrate", { stdio: "inherit" });
+execSync("npm run db:seed", { stdio: "inherit" });
+console.log("✅ Database reset, migrated, and seeded");