fixup! ✨(backend) add EmailTemplate model and API

Author: sdemagny

src/backend/core/models.py

@@ -1466,21 +1466,8 @@ def get_formatted_content(self) -> str:
         Returns:
             Formatted template content
         """
-        if self.type == TemplateTypeChoices.SIGNATURE:
-            # For signatures, prefer HTML body if available, otherwise text body
-            return self.html_body or self.text_body
-
-        # For non-signatures, return HTML body if available, otherwise text body
         return self.html_body or self.text_body
 
-    def is_signature(self) -> bool:
-        """Check if this template is a signature."""
-        return self.type == TemplateTypeChoices.SIGNATURE
-
-    def is_template(self) -> bool:
-        """Check if this template is a regular template (not a signature)."""
-        return self.type != TemplateTypeChoices.SIGNATURE
-
 
 class EmailTemplateMailDomain(BaseModel):
     """Through model for EmailTemplate to MailDomain relationship with is_default flag."""