chore: 重构数据库迁移与 nginx 配置目录

sproutgate-backend/internal/database/db.go

@@ -4,12 +4,40 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"strings"
 
 	"gorm.io/driver/mysql"
 	"gorm.io/gorm"
 	"gorm.io/gorm/logger"
 )
 
+// loadDotEnv 在当前工作目录查找 .env 文件并加载到进程环境变量中（已存在的变量不覆盖）。
+// 仅用于本地开发场景：生产部署通过 docker-compose / 容器环境变量直接注入，没有 .env 文件时静默跳过。
+func loadDotEnv() {
+	data, err := os.ReadFile(".env")
+	if err != nil {
+		return
+	}
+	for _, line := range strings.Split(string(data), "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		key, value, ok := strings.Cut(line, "=")
+		if !ok {
+			continue
+		}
+		key = strings.TrimSpace(key)
+		if key == "" {
+			continue
+		}
+		if _, exists := os.LookupEnv(key); exists {
+			continue
+		}
+		os.Setenv(key, strings.TrimSpace(value))
+	}
+}
+
 // DBConfig holds MySQL connection parameters.
 type DBConfig struct {
 	Host     string
@@ -24,39 +52,42 @@ func (c DBConfig) DSN() string {
 		c.User, c.Password, c.Host, c.Port, c.DBName)
 }
 
-func devConfig() DBConfig {
-	return DBConfig{
-		Host:     "10.1.1.100",
-		Port:     "3306",
-		User:     "sproutgate-test",
-		Password: "sproutgate-test",
-		DBName:   "sproutgate-test",
+// envConfig 从环境变量读取连接参数。Host/User/Password 没有内置默认值，必须由
+// 部署环境（本地 shell、.env、docker-compose 等）显式提供；DBName 默认统一为
+// "sproutgate"，开发和生产环境共用同一个库名。
+func envConfig() (DBConfig, error) {
+	host := os.Getenv("DB_HOST")
+	user := os.Getenv("DB_USER")
+	password := os.Getenv("DB_PASSWORD")
+	if host == "" || user == "" || password == "" {
+		return DBConfig{}, fmt.Errorf("缺少数据库环境变量，请设置 DB_HOST/DB_USER/DB_PASSWORD（或直接设置 DB_DSN）")
 	}
-}
 
-func prodConfig() DBConfig {
-	return DBConfig{
-		Host:     "192.168.1.100",
-		Port:     "3306",
-		User:     "sproutgate",
-		Password: "sproutgate",
-		DBName:   "sproutgate",
+	port := os.Getenv("DB_PORT")
+	if port == "" {
+		port = "3306"
 	}
+	dbName := os.Getenv("DB_NAME")
+	if dbName == "" {
+		dbName = "sproutgate"
+	}
+
+	return DBConfig{Host: host, Port: port, User: user, Password: password, DBName: dbName}, nil
 }
 
 // Open 根据环境变量打开数据库连接。
-// 优先级：DB_DSN > APP_ENV(production/prod -> 生产库) > 默认开发库
+// 优先级：DB_DSN（完整自定义连接串）> DB_HOST/DB_PORT/DB_USER/DB_PASSWORD/DB_NAME
 func Open() (*gorm.DB, error) {
+	loadDotEnv()
+
 	dsn := os.Getenv("DB_DSN")
 	if dsn == "" {
-		env := os.Getenv("APP_ENV")
-		if env == "production" || env == "prod" {
-			dsn = prodConfig().DSN()
-			log.Println("[database] 使用生产数据库 192.168.1.100:3306/sproutgate")
-		} else {
-			dsn = devConfig().DSN()
-			log.Println("[database] 使用开发数据库 10.1.1.100:3306/sproutgate-test")
+		cfg, err := envConfig()
+		if err != nil {
+			return nil, err
 		}
+		dsn = cfg.DSN()
+		log.Printf("[database] 使用数据库 %s:%s/%s", cfg.Host, cfg.Port, cfg.DBName)
 	} else {
 		log.Println("[database] 使用自定义 DB_DSN")
 	}