Add defaultFromName config option and bump to v0.0.7

- Add defaultFromName to MailingPluginConfig interface
- Update MailingService to format from field with name when available
- Add getDefaultFrom() helper method for consistent formatting
- Format as "Name" <email@domain.com> when both name and email are provided
- Bump version to 0.0.7

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

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

src/types/index.ts

@@ -22,6 +22,7 @@ export interface MailingPluginConfig {
     emails?: string | Partial<CollectionConfig>
   }
   defaultFrom?: string
+  defaultFromName?: string
   transport?: Transporter | MailingTransportConfig
   queue?: string
   retryAttempts?: number