feat(tenant): enable customization of message templates and email senders

apps/notification/backend/services/template_message_service.py

@@ -0,0 +1,27 @@
+from backend.models.models import MessageTemplateDoc
+
+class TemplateMessageService:
+    async def get_template(self, template_id, tenant_id, region):
+        return await MessageTemplateDoc.find_one({
+            "template_id": template_id,
+            "tenant_id": tenant_id,
+            "region": region,
+            "is_active": True
+        })
+
+    async def create_template(self, template:MessageTemplateDoc):
+        return await template.create()
+
+    async def update_template(self, id: str, tenant_id: str, data: dict):
+        template = await MessageTemplateDoc.get(id)
+        if not template or template.tenant_id != tenant_id:
+            raise PermissionError("Forbidden")
+        await template.set(data)
+        return template
+
+    async def delete_template(self, id: str, tenant_id: str):
+        template = await MessageTemplateDoc.get(id)
+        if not template or template.tenant_id != tenant_id:
+            raise PermissionError("Forbidden")
+        await template.delete()
+        return {"success": True}