Simplify job system architecture

- Replace createMailingJobs() function with static mailingJobs array
- Remove complex initialization dependencies and function wrappers
- Jobs now get MailingService from payload context instead of factory injection
- Fix PayloadCMS task handler return types to use proper {output: {}} format
- Eliminate potential initialization race conditions
- Cleaner, more straightforward job registration process

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

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

src/index.ts

@@ -12,7 +12,7 @@ export { default as EmailTemplates, createEmailTemplatesCollection } from './col
 export { default as Emails } from './collections/Emails.js'
 
 // Jobs (includes the send email task)
-export { createMailingJobs, sendEmailJob } from './jobs/index.js'
+export { mailingJobs, sendEmailJob } from './jobs/index.js'
 export type { SendEmailTaskInput } from './jobs/sendEmailTask.js'
 
 // Utility functions for developers