feat: drizzle schema + migrations for products/snapshots/alerts

drizzle.config.ts

@@ -0,0 +1,9 @@
+import 'dotenv/config'
+import { defineConfig } from 'drizzle-kit'
+
+export default defineConfig({
+  schema: './src/lib/db/schema.ts',
+  out: './drizzle',
+  dialect: 'postgresql',
+  dbCredentials: { url: process.env.DATABASE_URL! },
+})