feat(阶段1): drizzle schema 从本地库生成并剪掉 Django 框架表

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

apps/api/src/db/index.ts

@@ -0,0 +1,11 @@
+import { drizzle } from "drizzle-orm/postgres-js"
+import postgres from "postgres"
+
+import * as schema from "./schema"
+
+const url = process.env.DATABASE_URL ?? "postgres://onlinejudge:onlinejudge@localhost:5433/onlinejudge"
+
+const client = postgres(url)
+
+export const db = drizzle(client, { schema })
+export { schema }