Add configurable logger with PAYLOAD_MAILING_LOG_LEVEL support

- Created centralized logger utility using Payload's built-in logger system
- Added PAYLOAD_MAILING_LOG_LEVEL environment variable for log level configuration
- Replaced all console.log/error/warn calls with structured logger
- Added debug logging for immediate processing flow to help troubleshoot issues
- Improved logging context with specific prefixes (IMMEDIATE, PROCESSOR, JOB_SCHEDULER, etc.)
- Bumped version to 0.4.10

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/collections/Emails.ts

@@ -1,5 +1,6 @@
 import type { CollectionConfig } from 'payload'
 import { findExistingJobs, ensureEmailJob, updateEmailJobRelationship } from '../utils/jobScheduler.js'
+import { createContextLogger } from '../utils/logger.js'
 
 const Emails: CollectionConfig = {
   slug: 'emails',
@@ -220,7 +221,8 @@ const Emails: CollectionConfig = {
           }
         } catch (error) {
           // Log error but don't throw - we don't want to fail the email operation
-          console.error(`Failed to ensure job for email ${doc.id}:`, error)
+          const logger = createContextLogger(req.payload, 'EMAILS_HOOK')
+          logger.error(`Failed to ensure job for email ${doc.id}:`, error)
         }
       }
     ]