feat: Oracle 驱动完整化——回调体系、版本感知、驱动抽象层与测试套件

- 新增驱动抽象层 driver_adapter（go-ora/godror 双驱动切换）
- 新增 Update/Delete/Query 回调，完善 RETURNING INTO 子句
- 修复 create.go 事务悬挂行 BUG、批量 RowsAffected、主键 WHERE 注入
- 版本感知体系：分页/自增/序列默认值/BOOLEAN/32k VARCHAR2 分级能力判定
- 11g 序列+触发器自增、ON UPDATE 触发器、默认值智能转换
- 升级 go-ora v2.8.19 → v2.9.0
- 单元测试+模块测试+集成测试共 96 个，真实 Oracle 11g 全绿
- 测试 DSN 密码移除，改为 ORACLE_DSN 环境变量注入

tests/soft_delete_test.go

@@ -0,0 +1,37 @@
+package tests
+
+import (
+	"testing"
+)
+
+// TestSoftDeleteSetsDeletedAt 精确验证软删除后 DELETED_AT 确实被写入数据库
+func TestSoftDeleteSetsDeletedAt(t *testing.T) {
+	// 确保表存在并清空
+	if err := DB.AutoMigrate(&User{}); err != nil {
+		t.Fatalf("failed to migrate: %v", err)
+	}
+	clearTable(t, "TEST_USERS")
+
+	user := User{Name: "Soft Delete Exact", Email: "soft_exact@example.com", Age: 40}
+	if err := DB.Create(&user).Error; err != nil {
+		t.Fatalf("failed to create: %v", err)
+	}
+
+	// 软删除
+	if err := DB.Delete(&user).Error; err != nil {
+		t.Fatalf("failed to soft delete: %v", err)
+	}
+
+	// 直接验证 DELETED_AT 被写入：用 Unscoped 查询（绕过软删除过滤）
+	var deleted User
+	if err := DB.Unscoped().First(&deleted, user.ID).Error; err != nil {
+		t.Fatalf("failed to query unscoped: %v", err)
+	}
+	if !deleted.DeletedAt.Valid {
+		t.Errorf("expected DeletedAt to be valid (set), got invalid")
+	}
+	if deleted.DeletedAt.Time.IsZero() {
+		t.Errorf("expected DeletedAt to have a timestamp, got zero")
+	}
+	t.Logf("DeletedAt set to: %v", deleted.DeletedAt.Time)
+}