Consolidate response helpers and error logger to single modules

Two cleanups in one pass for the v1.14.0 'works on any platform' theme:

1. Response helpers — merged src/utils/responses.js and the root-level
   response-helpers.js into a single module at src/utils/responses.js.
   The old module had a richer set (created, noContent, validationError,
   unauthorized, forbidden, notFound, conflict) and is now re-exported
   from the new location. Updated 15 routes to import from
   src/utils/responses and deleted the root response-helpers.js.

2. Error logger — error-handler.js now uses the unified
   src/utils/logging.js#logError (same one src/app.js uses), so all errors
   go to one log file with one rotation policy. Removed the dead
   asyncHandler export (the real one is in src/utils/async-handler.js
   and is used everywhere). Deleted the legacy error-logger.js.

Both are invisible to users — same HTTP response shapes, same log file
path, same error format. Internal-only refactor.

dashcaddy-api/routes/auto-restart.js

@@ -8,7 +8,7 @@
  */
 
 const express = require('express');
-const { success } = require('../response-helpers');
+const { success } = require('../src/utils/responses');
 const { ValidationError, NotFoundError } = require('../errors');
 
 /**

dashcaddy-api/routes/backups.js

@@ -1,5 +1,5 @@
 const express = require('express');
-const { success } = require('../response-helpers');
+const { success } = require('../src/utils/responses');
 const fs = require('fs');
 const path = require('path');
 

dashcaddy-api/routes/config-drift.js

@@ -8,7 +8,7 @@
  */
 
 const express = require('express');
-const { success } = require('../response-helpers');
+const { success } = require('../src/utils/responses');
 const { ValidationError, NotFoundError } = require('../errors');
 
 /**

dashcaddy-api/routes/containers.js

@@ -2,7 +2,7 @@ const express = require('express');
 const { DOCKER } = require('../constants');
 const { paginate, parsePaginationParams } = require('../pagination');
 const { NotFoundError } = require('../errors');
-const { success } = require('../response-helpers');
+const { success } = require('../src/utils/responses');
 
 /**
  * Containers route factory

dashcaddy-api/routes/credentials.js

@@ -1,5 +1,5 @@
 const express = require('express');
-const { success, error: errorResponse } = require('../response-helpers');
+const { success, error: errorResponse } = require('../src/utils/responses');
 
 /**
  * Credentials routes factory

dashcaddy-api/routes/dependencies.js

@@ -15,7 +15,7 @@
  */
 
 const express = require('express');
-const { success, error: errorResponse } = require('../response-helpers');
+const { success, error: errorResponse } = require('../src/utils/responses');
 const { NotFoundError, ValidationError } = require('../errors');
 
 /**

dashcaddy-api/routes/dns.js

@@ -4,7 +4,7 @@ const fsp = require('fs').promises;
 const validatorLib = require('validator');
 const { APP, TIMEOUTS, CADDY, DNS_RECORD_TYPES, REGEX, SESSION_TTL } = require('../constants');
 const { exists } = require('../fs-helpers');
-const { success, error: errorResponse } = require('../response-helpers');
+const { success, error: errorResponse } = require('../src/utils/responses');
 const { ValidationError, AuthenticationError, NotFoundError } = require('../errors');
 
 /**

dashcaddy-api/routes/docker-resources.js

@@ -1,5 +1,5 @@
 const express = require('express');
-const { success } = require('../response-helpers');
+const { success } = require('../src/utils/responses');
 const { ValidationError } = require('../errors');
 
 /**

dashcaddy-api/routes/errorlogs.js

@@ -3,7 +3,7 @@ const fs = require('fs');
 const fsp = require('fs').promises;
 const { exists } = require('../fs-helpers');
 const { paginate, parsePaginationParams } = require('../pagination');
-const { success } = require('../response-helpers');
+const { success } = require('../src/utils/responses');
 
 /**
  * Error logs routes factory

dashcaddy-api/routes/health.js

@@ -7,7 +7,7 @@ const { exists } = require('../fs-helpers');
 const { paginate, parsePaginationParams } = require('../pagination');
 const platformPaths = require('../platform-paths');
 const { resolveServiceUrl } = require('../url-resolver');
-const { success, error: errorResponse } = require('../response-helpers');
+const { success, error: errorResponse } = require('../src/utils/responses');
 const { ValidationError } = require('../errors');
 
 /**

dashcaddy-api/routes/license.js

@@ -1,5 +1,5 @@
 const express = require('express');
-const { success, error: errorResponse } = require('../response-helpers');
+const { success, error: errorResponse } = require('../src/utils/responses');
 const { ValidationError } = require('../errors');
 
 /**

dashcaddy-api/routes/monitoring.js

@@ -1,5 +1,5 @@
 const express = require('express');
-const { success } = require('../response-helpers');
+const { success } = require('../src/utils/responses');
 
 /**
  * Monitoring routes factory

dashcaddy-api/routes/services.js

@@ -10,7 +10,7 @@ const { exists } = require('../fs-helpers');
 const { paginate, parsePaginationParams } = require('../pagination');
 const { ValidationError, NotFoundError, ConflictError } = require('../errors');
 const { resolveServiceUrl } = require('../url-resolver');
-const { success, error: errorResponse } = require('../response-helpers');
+const { success, error: errorResponse } = require('../src/utils/responses');
 const platformPaths = require('../platform-paths');
 
 /**

dashcaddy-api/routes/ssl-monitor.js

@@ -6,7 +6,7 @@
  */
 
 const express = require('express');
-const { success, error: errorResponse, notFound } = require('../response-helpers');
+const { success, error: errorResponse, notFound } = require('../src/utils/responses');
 
 /**
  * SSL Monitor route factory

dashcaddy-api/routes/themes.js

@@ -1,7 +1,7 @@
 const express = require('express');
 const fs = require('fs');
 const path = require('path');
-const { success } = require('../response-helpers');
+const { success } = require('../src/utils/responses');
 const { ValidationError, NotFoundError } = require('../errors');
 const platformPaths = require('../platform-paths');