feat(server): support SQLite via DB_TYPE env var

server/internal/config/database.go

@@ -5,6 +5,7 @@ import (
 	"log"
 
 	"gorm.io/driver/mysql"
+	"gorm.io/driver/sqlite"
 	"gorm.io/gorm"
 	"github.com/gouki/lunar-server/internal/model"
 )
@@ -13,16 +14,27 @@ var DB *gorm.DB
 
 // InitDB 初始化数据库连接
 func InitDB(cfg *Config) error {
-	dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
-		cfg.Database.User,
-		cfg.Database.Password,
-		cfg.Database.Host,
-		cfg.Database.Port,
-		cfg.Database.Name,
-	)
-
 	var err error
-	DB, err = gorm.Open(mysql.Open(dsn), &gorm.Config{})
+
+	switch cfg.Database.Type {
+	case "sqlite", "sqlite3":
+		// DB_NAME 作为 SQLite 文件路径，例如 /app/data/lunar.db
+		dbPath := cfg.Database.Name
+		if dbPath == "" {
+			dbPath = "lunar.db"
+		}
+		DB, err = gorm.Open(sqlite.Open(dbPath), &gorm.Config{})
+	default:
+		dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
+			cfg.Database.User,
+			cfg.Database.Password,
+			cfg.Database.Host,
+			cfg.Database.Port,
+			cfg.Database.Name,
+		)
+		DB, err = gorm.Open(mysql.Open(dsn), &gorm.Config{})
+	}
+
 	if err != nil {
 		return fmt.Errorf("failed to connect database: %w", err)
 	}