Merge krystie-improvements into main

Resolves 24 conflicts between Hermes (DC-008/009/010 + response-helper
envelope standardization) and Krystie (DC-005 src/ refactor path fixes,
DC-006 TOTP integration, DC-007 new test suites, cloud backup
destinations).

Conflict resolutions:
- src/utils/logging.js:    took ours (consumers depend on logError/
                            safeErrorMessage/createLogger exports)
- src/config/site.js:      merged (her factored validateAndLogConfig +
                            applyConfigFields helpers)
- src/context/dns.js:      took hers (admin/readonly role iteration for
                            write operations)
- src/utilities/backup-
  manager.js:              took hers (Dropbox/WebDAV/SFTP cloud feature)
- status/dist/*, status/
  sw.js:                   took hers (minified bundles + newer SW cache)

Additional fix (post-merge regression):
- src/monitoring/health-checker.js: fixed DC-005 path miss —
  'require(./platform-paths)' → 'require(../../platform-paths)'

Test status: 921/922 passing. One known failure in logging.test.js
(async file-handle timing) tracked as follow-up.

dashcaddy-api/routes/health.js

@@ -2,13 +2,13 @@ const express = require('express');
 const fs = require('fs');
 const path = require('path');
 const { execSync } = require('child_process');
-const { TIMEOUTS } = require('../constants');
-const { exists } = require('../fs-helpers');
-const { paginate, parsePaginationParams } = require('../pagination');
+const { TIMEOUTS } = require('../src/utilities/constants');
+const { exists } = require('../src/utilities/fs-helpers');
+const { paginate, parsePaginationParams } = require('../src/utilities/pagination');
 const platformPaths = require('../platform-paths');
-const { resolveServiceUrl } = require('../url-resolver');
-const { success, error: errorResponse } = require('../response-helpers');
-const { ValidationError } = require('../errors');
+const { resolveServiceUrl } = require('../src/utilities/url-resolver');
+const { success, error: errorResponse, errorResponse: sendError, ok, notFound } = require('../src/utils/responses');
+const { ValidationError } = require('../src/utilities/errors');
 
 /**
  * Health routes factory
@@ -190,7 +190,7 @@ module.exports = function({
 
     // Load service config
     if (!await exists(SERVICES_FILE)) {
-      const { NotFoundError } = require('../errors');
+      const { NotFoundError } = require('../src/utilities/errors');
       throw new NotFoundError('Services file');
     }
 
@@ -199,7 +199,7 @@ module.exports = function({
     const service = services.find(s => (s.id || s.name?.toLowerCase()) === serviceId);
 
     if (!service) {
-      const { NotFoundError } = require('../errors');
+      const { NotFoundError } = require('../src/utilities/errors');
       throw new NotFoundError('Service');
     }
 
@@ -273,11 +273,7 @@ module.exports = function({
     try {
       // Check if certificate exists
       if (!await exists(rootCertPath)) {
-        return res.json({
-          status: 'error',
-          message: 'Root CA certificate not found',
-          daysUntilExpiration: null
-        });
+        return sendError(res, 404, 'Root CA certificate not found', { caStatus: 'error', daysUntilExpiration: null });
       }
 
       const dates = execSync(`openssl x509 -in "${rootCertPath}" -noout -dates`).toString();
@@ -286,36 +282,32 @@ module.exports = function({
       const daysUntilExpiration = Math.floor((expirationDate - new Date()) / (1000 * 60 * 60 * 24));
 
       // Alert thresholds
-      let status = 'healthy';
+      let caStatus = 'healthy';
       let message = `CA certificate valid for ${daysUntilExpiration} days`;
 
       if (daysUntilExpiration < 0) {
-        status = 'critical';
+        caStatus = 'critical';
         message = `CA certificate EXPIRED ${Math.abs(daysUntilExpiration)} days ago!`;
       } else if (daysUntilExpiration < 7) {
-        status = 'critical';
+        caStatus = 'critical';
         message = `CA certificate expires in ${daysUntilExpiration} days!`;
       } else if (daysUntilExpiration < 30) {
-        status = 'critical';
+        caStatus = 'critical';
         message = `CA certificate expires in ${daysUntilExpiration} days!`;
       } else if (daysUntilExpiration < 90) {
-        status = 'warning';
+        caStatus = 'warning';
         message = `CA certificate expires in ${daysUntilExpiration} days`;
       }
 
-      res.json({
-        status: status,
-        message: message,
-        daysUntilExpiration: daysUntilExpiration,
+      ok(res, {
+        caStatus,
+        message,
+        daysUntilExpiration,
         expiresAt: notAfter
       });
     } catch (error) {
       await logError('GET /api/health/ca', error);
-      res.json({
-        status: 'error',
-        message: error.message,
-        daysUntilExpiration: null
-      });
+      sendError(res, 500, error.message, { caStatus: 'error', daysUntilExpiration: null });
     }
   }, 'health-ca'));
 
@@ -349,7 +341,7 @@ module.exports = function({
     const hours = parseInt(req.query.hours) || 24;
     const stats = healthChecker.getServiceStats(req.params.serviceId, hours);
     if (!stats) {
-      const { NotFoundError } = require('../errors');
+      const { NotFoundError } = require('../src/utilities/errors');
       throw new NotFoundError('Service');
     }
     success(res, { stats });