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

package.json

@@ -8,8 +8,12 @@
     "start": "next start",
     "lint": "eslint",
     "lint:fix": "eslint --fix",
-    "migrate": "node supabase/push-migrations.js",
-    "migrate:one": "node supabase/push-migrations.js",
+    "migrate": "node scripts/migrate.js",
+    "migrate:one": "node scripts/migrate.js",
+    "db:migrate": "node scripts/migrate.js",
+    "db:seed": "tsx db/seed.ts",
+    "db:reset": "node scripts/db-reset.js",
+    "db:studio": "drizzle-kit studio",
     "type-check": "npx tsc --noEmit",
     "test": "vitest run",
     "test:watch": "vitest",
@@ -27,6 +31,7 @@
     "@supabase/supabase-js": "^2.105.3",
     "@upstash/ratelimit": "^2.0.8",
     "@upstash/redis": "^1.38.0",
+    "drizzle-orm": "^0.36.4",
     "exceljs": "^4.4.0",
     "framer-motion": "^12.40.0",
     "gsap": "^3.15.0",
@@ -60,12 +65,14 @@
     "@types/uuid": "^11.0.0",
     "@vitejs/plugin-react": "^4.7.0",
     "dotenv": "^17.4.2",
+    "drizzle-kit": "^0.30.6",
     "eslint": "^9",
     "eslint-config-next": "16.2.5",
     "jsdom": "^25.0.1",
     "pg": "^8.20.0",
     "playwright": "^1.59.1",
     "tailwindcss": "^4",
+    "tsx": "^4.22.4",
     "typescript": "^5",
     "vite-tsconfig-paths": "^5.1.4",
     "vitest": "^2.1.9"