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_del.yaml

@@ -0,0 +1,18 @@
+version: 1
+name: cf_dns_del
+description: 删除 DNS 记录（按 record_id）
+steps:
+  - id: del_dns
+    action: ssh.exec
+    on_fail: stop
+    with:
+      target: hwsg
+      command: "CF_API_TOKEN=${env_cf_api_token} INPUT_RECORD_ID=${env.INPUT_RECORD_ID} python3 - <<'PY'\nimport os,requests,json\nrec=os.getenv('INPUT_RECORD_ID','')\ntoken=os.getenv('CF_API_TOKEN','')\nemail=os.getenv('CF_API_EMAIL','')\nheaders={'Authorization':'Bearer '+token,'Content-Type':'application/json'}\n# find record across zones\nzones=requests.get('https://api.cloudflare.com/client/v4/zones?per_page=200', headers=headers, timeout=15).json().get('result',[])\nzone_id=None\nfor z in zones:\n    zid=z.get('id')\n    r=requests.get(f'https://api.cloudflare.com/client/v4/zones/{zid}/dns_records/{rec}', headers=headers, timeout=15)\n    if r.status_code==200 and r.json().get('success'):\n        zone_id=zid\n        break\nif not zone_id:\n    print(json.dumps({'success':False,'errors':['record_not_found']}))\n    raise SystemExit(1)\nresp=requests.delete(f'https://api.cloudflare.com/client/v4/zones/{zone_id}/dns_records/{rec}', headers=headers, timeout=15)\nprint(resp.text)\nPY"
+  - id: assert
+    action: assert.json
+    on_fail: stop
+    with:
+      source_step: del_dns
+      expect_success: true
+      required_paths:
+        - "success"