Refactor error logging to use getErrorMessage utility

- Updated multiple classes to replace direct error message access with getErrorMessage function for improved error handling and consistency.
- Modified error logging in CertRequirementManager, CloudflareDomainSync, OneboxDnsManager, OneboxDockerManager, OneboxHttpServer, Onebox, OneboxRegistriesManager, and OneboxServicesManager.
- Ensured that all error messages logged provide a standardized format and improved clarity.

ts/classes/cloudflare-sync.ts

@@ -7,6 +7,7 @@
 
 import * as plugins from '../plugins.ts';
 import { logger } from '../logging.ts';
+import { getErrorMessage } from '../utils/error.ts';
 import { OneboxDatabase } from './database.ts';
 import type { IDomain } from '../types.ts';
 
@@ -33,7 +34,7 @@ export class CloudflareDomainSync {
       this.cloudflareAccount = new plugins.cloudflare.CloudflareAccount(apiKey);
       logger.info('Cloudflare domain sync initialized');
     } catch (error) {
-      logger.error(`Failed to initialize Cloudflare sync: ${error.message}`);
+      logger.error(`Failed to initialize Cloudflare sync: ${getErrorMessage(error)}`);
       throw error;
     }
   }
@@ -98,7 +99,7 @@ export class CloudflareDomainSync {
             logger.info(`Added new domain from Cloudflare: ${domain}`);
           }
         } catch (error) {
-          logger.error(`Failed to sync zone ${zone.name}: ${error.message}`);
+          logger.error(`Failed to sync zone ${zone.name}: ${getErrorMessage(error)}`);
         }
       }
 
@@ -107,7 +108,7 @@ export class CloudflareDomainSync {
 
       logger.success(`Cloudflare zone sync completed: ${zones.length} zone(s) synced`);
     } catch (error) {
-      logger.error(`Cloudflare zone sync failed: ${error.message}`);
+      logger.error(`Cloudflare zone sync failed: ${getErrorMessage(error)}`);
       throw error;
     }
   }
@@ -138,7 +139,7 @@ export class CloudflareDomainSync {
         logger.info(`Marked ${obsoleteCount} domain(s) as obsolete`);
       }
     } catch (error) {
-      logger.error(`Failed to mark obsolete domains: ${error.message}`);
+      logger.error(`Failed to mark obsolete domains: ${getErrorMessage(error)}`);
     }
   }