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

runbooks/cf_dns_list.yaml

@@ -0,0 +1,18 @@
+version: 1
+name: cf_dns_list
+description: 列出某个 Zone 的 DNS 记录
+steps:
+  - id: list_dns
+    action: ssh.exec
+    on_fail: stop
+    with:
+      target: hwsg
+      command: "CF_ACCOUNT_ID=${env_cf_account_id} CF_API_TOKEN=${env_cf_api_token} INPUT_ZONE_ID=${env.INPUT_ZONE_ID} python3 -c \"import os,requests; zone=os.getenv('INPUT_ZONE_ID',''); token=os.getenv('CF_API_TOKEN',''); email=os.getenv('CF_API_EMAIL',''); headers={'Authorization':'Bearer '+token,'Content-Type':'application/json'}; url='https://api.cloudflare.com/client/v4/zones/%s/dns_records'%zone; resp=requests.get(url, headers=headers, timeout=15); print(resp.text)\""
+  - id: assert
+    action: assert.json
+    on_fail: stop
+    with:
+      source_step: list_dns
+      expect_success: true
+      required_paths:
+        - "success"