docs(skills): 添加 Better Auth 最佳实践与安全配置指南

drizzle.config.ts

@@ -0,0 +1,11 @@
+import 'dotenv/config';
+import { defineConfig } from 'drizzle-kit';
+
+export default defineConfig({
+  out: './drizzle',
+  schema: './src/db/schema.ts',
+  dialect: 'postgresql',
+  dbCredentials: {
+    url: process.env.DATABASE_URL!,
+  },
+});