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/templates.js

@@ -20,6 +20,7 @@ const { exists } = require('../../fs-helpers');
  * @returns {express.Router}
  */
 const { REGEX } = require('../../constants');
+const { ok } = require('../../src/utils/responses');
 
 module.exports = function({
   servicesStateManager, asyncHandler, helpers,
@@ -42,8 +43,7 @@ module.exports = function({
 
   // Get available app templates
   router.get('/templates', asyncHandler(async (req, res) => {
-    res.json({
-      success: true,
+    ok(res, {
       templates: ctx.APP_TEMPLATES,
       categories: ctx.TEMPLATE_CATEGORIES,
       difficultyLevels: ctx.DIFFICULTY_LEVELS
@@ -58,7 +58,7 @@ module.exports = function({
       const { NotFoundError } = require('../../errors');
       throw new NotFoundError('App template');
     }
-    res.json({ success: true, template });
+    ok(res, { template });
   }, 'apps-template-detail'));
 
   // Check port availability
@@ -80,7 +80,7 @@ module.exports = function({
     const usedPorts = await docker.getUsedPorts();
     for (let port = basePort; port < basePort + maxAttempts; port++) {
       if (!usedPorts.has(port)) {
-        res.json({ success: true, suggestedPort: port, basePort });
+        ok(res, { suggestedPort: port, basePort });
         return;
       }
     }
@@ -170,8 +170,7 @@ module.exports = function({
       log.warn('deploy', 'Service update warning', { error: error.message || String(error) });
     }
 
-    res.json({
-      success: true,
+    ok(res, {
       message: `Subdomain updated: ${oldSubdomain} -> ${newSubdomain}`,
       newUrl: `https://${ctx.buildDomain(newSubdomain)}`,
       results