[优化] 重构数据库迁移逻辑，添加版本管理和验证功能

openflare_server/model/migrate/v9.go

@@ -0,0 +1,27 @@
+package migrate
+
+import "gorm.io/gorm"
+
+func init() {
+	Register(V9())
+}
+
+func V9() Migration {
+	return Migration{
+		FromVersion: 8,
+		ToVersion:   9,
+		Migrate:     migrateV9,
+		Validate:    validateV9,
+	}
+}
+
+func migrateV9(ctx Context, db *gorm.DB, backend string) error {
+	if err := migrateV8(ctx, db, backend); err != nil {
+		return err
+	}
+	return nil
+}
+
+func validateV9(ctx Context, db *gorm.DB, backend string) error {
+	return ctx.ValidateDatabaseSchemaVersion(db, backend, 9)
+}