fix: 移除 dotenv/config 覆盖 build-arg 值，统一 mariadb:// 协议

prisma.config.ts

@@ -1,6 +1,5 @@
-// This file was generated by Prisma, and assumes you have installed the following:
-// npm install --save-dev prisma dotenv
-import "dotenv/config";
+// 运行时由 Dockerfile build-arg 注入 DATABASE_URL
+// 本地开发时手动 export DATABASE_URL 或用 .env 加载（next.config.mjs 处理）
 import { defineConfig } from "prisma/config";
 
 export default defineConfig({