feat(db): Drizzle ORM schema and migrations

Schema domains: users/auth, recipes, social, meal-planning, tiers/usage, webhooks.
Includes Better Auth tables, audit_logs, site_settings, push_subscriptions,
user_model_prefs, user_nutrition_goals. Migrations 0000–0008 applied.

packages/db/src/client.ts

@@ -0,0 +1,11 @@
+import { drizzle } from "drizzle-orm/postgres-js";
+import postgres from "postgres";
+import * as schema from "./schema";
+
+const connectionString =
+  process.env["DATABASE_URL"] ?? "postgresql://epicure:epicure@localhost:5432/epicure";
+
+const client = postgres(connectionString, { max: 10 });
+
+export const db = drizzle(client, { schema });
+export type Db = typeof db;