feat: 模块化命令框架 + runbook 严格断言与查询结果回传

- core/module: 命令模板、门控（feature flag/confirm/dry-run）、ecode 错误标签、ResultFormatter
- runbook executor: http.get/http.post/assert.json(expect_success 严格断言)、目标主机管理、任务落库、最终 stdout 直接回传
- cf 模块: /cf dns list 支持域名自动解析 zone_id；dns list/zones/workers list 格式化回传；API success:false 判真失败
- 全部 CF/CPA runbook 接入严格断言，杜绝假阳性 success
- 新增 cpa/cfdav/mail/sub 模块与 runbooks；QQ 订阅到期提醒调度
- Web 后台: 模块设置(CF/CPA/cfdav/AI)、OPS 任务、渠道管理、审计页

internal/core/module/runner.go

@@ -0,0 +1,48 @@
+package module
+
+import (
+	"fmt"
+	"strings"
+
+	"gorm.io/gorm"
+
+	"ops-assistant/internal/core/ecode"
+	"ops-assistant/internal/core/policy"
+	"ops-assistant/internal/core/runbook"
+)
+
+type Runner struct {
+	db   *gorm.DB
+	exec *runbook.Executor
+}
+
+func NewRunner(db *gorm.DB, exec *runbook.Executor) *Runner {
+	return &Runner{db: db, exec: exec}
+}
+
+func (r *Runner) Run(commandText string, operator int64, req Request) (uint, string, error) {
+	if strings.TrimSpace(req.RunbookName) == "" {
+		return 0, "", fmt.Errorf(ecode.Tag(ecode.ErrStepFailed, "runbook 不能为空"))
+	}
+	if req.DryRun {
+		if !req.Gate.AllowDryRun {
+			return 0, "", fmt.Errorf(ecode.Tag(ecode.ErrStepFailed, "当前命令不允许 dry-run"))
+		}
+		return 0, "dry-run", nil
+	}
+	if err := policy.CheckGate(r.db, policy.GateRequest{
+		NeedFlag:       req.Gate.NeedFlag,
+		RequireConfirm: req.Gate.RequireConfirm,
+		ConfirmToken:   req.ConfirmToken,
+		ExpectedToken:  req.Gate.ExpectedToken,
+		AllowDryRun:    req.Gate.AllowDryRun,
+		DryRun:         req.DryRun,
+	}); err != nil {
+		code := ecode.ErrFeatureDisabled
+		if strings.Contains(err.Error(), "confirm") || strings.Contains(err.Error(), "确认") {
+			code = ecode.ErrConfirmRequired
+		}
+		return 0, "", fmt.Errorf(ecode.Tag(code, err.Error()))
+	}
+	return r.exec.RunWithInputsAndMeta(commandText, req.RunbookName, operator, req.Inputs, req.Meta)
+}