Remove unused BaseEmail imports

- Remove BaseEmail import from sendEmail.ts (no longer used after type refactoring)
- Remove BaseEmail import from sendEmailTask.ts (no longer used after type refactoring)
- BaseEmail types are still used in MailingService.ts for proper type casting

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

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

src/jobs/sendEmailTask.ts

@@ -1,6 +1,5 @@
 import { sendEmail } from '../sendEmail.js'
 import {Email, EmailTemplate} from '../payload-types.js'
-import {BaseEmail} from "../types/index.js"
 
 export interface SendEmailTaskInput {
   // Template mode fields