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/removal.js

@@ -1,6 +1,7 @@
 const express = require('express');
 const { exists } = require('../../fs-helpers');
 const { logError } = require('../../src/utils/logging');
+const { ok } = require('../../src/utils/responses');
 
 module.exports = function({
   docker, caddy, servicesStateManager, asyncHandler, log, helpers,
@@ -135,7 +136,7 @@ module.exports = function({
         results.service = error.message;
       }
 
-      res.json({ success: true, message: `App ${appId} removal completed`, results });
+      ok(res, { message: `App ${appId} removal completed`, results });
     } catch (error) {
       await logError('app-removal', error);
       errorResponse(res, 500, ctx.safeErrorMessage(error), { results });