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# 数据库连接。留空时后端自动使用仓库根目录下的 data/math.db
# 例：sqlite:////Users/you/nex_math/data/math.db
DATABASE_URL=
# 允许跨域访问的前端地址，逗号分隔
CORS_ORIGINS=http://localhost:5173,http://127.0.0.1:5173
# 可选：为将来接入真实大模型讲解预留（当前本地规则版无需配置）
OPENAI_API_KEY=
# JWT 签名密钥（生产环境务必改成随机长字符串）
JWT_SECRET=