DC-010: Convert remaining bare res.json({success,...}) envelopes to response helper

Routes covered in this batch:
- routes/events.js (1 call: GET /status)
- routes/workflows.js (6 calls: GET/POST/PUT/DELETE /workflows, POST /test, POST /:id/toggle)
- routes/openclaw.js (4 calls: GET /:hostname, DELETE /:hostname, POST /connect, GET /status)
- routes/dns.js (1 call: POST /credentials per-server results envelope)

Wire format unchanged — each handler now produces the same {success, ...} shape via success(). Net result: every {success, ...} envelope in routes/ now flows through the response helper, leaving only the intentional raw-array calls (services.js) and error-path envelopes for separate cleanup.

dashcaddy-api/routes/events.js

@@ -8,9 +8,10 @@ const express = require('express');
  * @param {Object} deps.healthChecker - Health checker
  * @param {Object} deps.updateManager - Update manager
  * @param {Function} deps.logError - Error logging function
+ * @param {Function} deps.ok - Success response helper
  * @returns {express.Router}
  */
-module.exports = function({ resourceMonitor, healthChecker, updateManager, logError }) {
+module.exports = function({ resourceMonitor, healthChecker, updateManager, logError, ok }) {
   const router = express.Router();
   const clients = new Set();
 
@@ -104,7 +105,7 @@ module.exports = function({ resourceMonitor, healthChecker, updateManager, logEr
 
   // Client count (useful for debugging)
   router.get('/clients', (req, res) => {
-    res.json({ success: true, count: clients.size });
+    ok(res, { count: clients.size });
   });
 
   return router;