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/arr/config.js

@@ -3,6 +3,7 @@ const { APP_PORTS, ARR_SERVICES } = require('../../constants');
 const { validateURL, validateToken } = require('../../input-validator');
 const { ValidationError, AuthenticationError, NotFoundError } = require('../../errors');
 const { logError } = require('../../src/utils/logging');
+const { ok, successMessage } = require('../../src/utils/responses');
 
 /**
  * Arr configuration routes factory
@@ -258,11 +259,7 @@ module.exports = function(ctx) {
         const version = service === 'plex' ? data.MediaContainer?.version : data.version;
         const appName = service === 'plex' ? 'Plex' : data.appName;
         log.info('arr', 'Service connection successful', { service, appName, version });
-        return res.json({
-          success: true,
-          version,
-          appName
-        });
+        return ok(res, { version, appName });
       } else if (response.status === 401) {
         throw new AuthenticationError('Invalid API key');
       } else if (response.status === 404) {
@@ -553,7 +550,7 @@ module.exports = function(ctx) {
       const metadata = await credentialManager.getMetadata(`arr.${service}.apikey`);
       const storedProfileId = metadata?.qualityProfileId || null;
 
-      res.json({ success: true, profiles: mapped, storedProfileId });
+      ok(res, { profiles: mapped, storedProfileId });
     } catch (e) {
       if (e.cause?.code === 'ECONNREFUSED') {
         return errorResponse(res, 502, 'Connection refused — is the service running?');
@@ -588,7 +585,7 @@ module.exports = function(ctx) {
     existing.qualityProfileName = qualityProfileName || null;
     await credentialManager.storeMetadata(credKey, existing);
 
-    res.json({ success: true, message: `Quality profile updated for ${service}` });
+    successMessage(res, `Quality profile updated for ${service}`);
   }, 'arr-quality-profile-save'));
 
   return router;