v1.13.4: Standardize all route responses to use response helpers

Convert ~160 raw res.json()/res.status().json() calls across 32+ files
to use centralized helpers from src/utils/responses.js (ok, errorResponse,
successMessage, notFound, validationError, forbidden, unauthorized, conflict).

No behavior changes — response shapes are identical. Future schema changes
(e.g., requestId envelope) only need to update one module.

Fix error vs errorResponse signature mismatch in routes/health.js CA cert
endpoint where error(res, message, statusCode) was being called with
errorResponse(res, statusCode, message, extras) argument order.

Files changed: middleware.js, csrf-protection.js, error-handler.js,
license-manager.js, src/app.js, and 27 route files.

Test suite: 755 pass / 4 pre-existing failures (services credential tests).

dashcaddy-api/routes/apps/deploy.js

@@ -8,6 +8,7 @@ const { exists } = require('../../fs-helpers');
 const platformPaths = require('../../platform-paths');
 const { ValidationError } = require('../../errors');
 const { logError } = require('../../src/utils/logging');
+const { ok } = require('../../src/utils/responses');
 /**
  * Apps deployment routes factory
  * @param {Object} deps - Explicit dependencies
@@ -243,9 +244,9 @@ module.exports = function({ docker, caddy, credentialManager, servicesStateManag
     if (!template) throw new ValidationError('Invalid app template');
     const existingContainer = await helpers.findExistingContainerByImage(template);
     if (existingContainer) {
-      res.json({ success: true, exists: true, container: existingContainer, message: `Found existing ${template.name} container: ${existingContainer.name}` });
+      ok(res, { exists: true, container: existingContainer, message: `Found existing ${template.name} container: ${existingContainer.name}` });
     } else {
-      res.json({ success: true, exists: false, message: `No existing ${template.name} container found` });
+      ok(res, { exists: false, message: `No existing ${template.name} container found` });
     }
   }, 'check-existing'));