Refactor and clean up job organization

- Properly encapsulate processEmailsJob in its own file with handler and definition
- Clean up index.ts to remove duplicate code and just export job definitions
- Add comprehensive JSDoc comments for better documentation
- Separate job handler logic from job definition for clarity
- Fix job scheduling to use correct field names
- Bump version to 0.2.1

src/jobs/sendEmailTask.ts

@@ -64,6 +64,10 @@ function transformTaskInputToSendEmailOptions(taskInput: SendEmailTaskInput) {
   return sendEmailOptions
 }
 
+/**
+ * Job definition for sending emails
+ * Can be used through Payload's job queue system to send emails programmatically
+ */
 export const sendEmailJob = {
   slug: 'send-email',
   label: 'Send Email',