Replaced the `EncryptedPassword` property in `EmailAccountDto` with `Password` and `PasswordEncrypted` to support both plain text and encrypted passwords. Updated `LimilabsEmailService` to use the new properties, checking the `PasswordEncrypted` flag to determine whether decryption is needed.
- Add static constructor to register System.Text.Encoding.CodePages
- Required for windows-1252 and other extended code page support
- Fixes encoding issues with international email content