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/tailscale.js

@@ -3,6 +3,7 @@ const fs = require('fs');
 const { TAILSCALE } = require('../constants');
 const { exists } = require('../fs-helpers');
 const { ValidationError, NotFoundError } = require('../errors');
+const { ok, successMessage, unauthorized } = require('../src/utils/responses');
 
 /**
  * Tailscale route factory
@@ -35,8 +36,7 @@ module.exports = function({
     const localIP = await tailscale.getLocalIP();
 
     if (!status) {
-      return res.json({
-        success: true,
+      return ok(res, {
         installed: false,
         connected: false,
         message: 'Tailscale not available or not running'
@@ -58,8 +58,7 @@ module.exports = function({
       }
     }
 
-    res.json({
-      success: true,
+    ok(res, {
       installed: true,
       connected: status.BackendState === 'Running',
       backendState: status.BackendState,
@@ -85,8 +84,7 @@ module.exports = function({
 
     await tailscale.save();
 
-    res.json({
-      success: true,
+    ok(res, {
       message: 'Tailscale configuration updated',
       config: tailscale.config
     });
@@ -101,8 +99,7 @@ module.exports = function({
     const ipsToCheck = [clientIP, forwardedFor, realIP].filter(Boolean);
     const isTailscale = ipsToCheck.some(ip => tailscale.isTailscaleIP(ip.toString().split(',')[0].trim()));
 
-    res.json({
-      success: true,
+    ok(res, {
       isTailscale,
       clientIP,
       forwardedFor: forwardedFor || null,
@@ -114,7 +111,7 @@ module.exports = function({
   router.get('/devices', asyncHandler(async (req, res) => {
     const status = await tailscale.getStatus();
     if (!status || !status.Peer) {
-      return res.json({ success: true, devices: [] });
+      return ok(res, { devices: [] });
     }
 
     const devices = [];
@@ -141,7 +138,7 @@ module.exports = function({
       });
     }
 
-    res.json({ success: true, devices });
+    ok(res, { devices });
   }, 'tailscale-devices'));
 
   // Toggle Tailscale-only mode for an existing service
@@ -190,8 +187,7 @@ module.exports = function({
       });
     }
 
-    res.json({
-      success: true,
+    ok(res, {
       message: `Service ${domain} is now ${tailscaleOnly !== false ? 'protected by' : 'no longer restricted to'} Tailscale`,
       tailscaleOnly: tailscaleOnly !== false
     });
@@ -254,7 +250,7 @@ module.exports = function({
       log.warn('tailscale', 'Initial sync after OAuth config failed', { error: e.message });
     }
 
-    res.json({ success: true, config: tailscale.config });
+    ok(res, { config: tailscale.config });
   }, 'tailscale-oauth-config'));
 
   // Remove OAuth credentials and disable API sync
@@ -269,7 +265,7 @@ module.exports = function({
 
     tailscale.stopSync();
 
-    res.json({ success: true, message: 'Tailscale OAuth credentials removed' });
+    successMessage(res, 'Tailscale OAuth credentials removed');
   }, 'tailscale-oauth-delete'));
 
   // Get enriched device list from Tailscale API
@@ -279,8 +275,7 @@ module.exports = function({
     }
 
     // Return cached devices from last sync
-    res.json({
-      success: true,
+    ok(res, {
       devices: tailscale.config.devices || [],
       lastSync: tailscale.config.lastSync
     });
@@ -294,8 +289,7 @@ module.exports = function({
 
     const devices = await tailscale.syncAPI();
 
-    res.json({
-      success: true,
+    ok(res, {
       devices: devices || [],
       lastSync: tailscale.config.lastSync
     });
@@ -325,7 +319,7 @@ module.exports = function({
       sshRuleCount: (acl.ssh || []).length
     };
 
-    res.json({ success: true, acl, summary });
+    ok(res, { acl, summary });
   }, 'tailscale-acl'));
 
   return router;