feat: 站内信 (#6183)

* 添加站内信

* s

* s

* 添加接口

* fix

* fix

* 重构了一些

* 完成

* 完善

* s

* s

* s

* s

* s

* s

* 测试ok

* 替换业务中发送消息的方式

* 修改

* s

* 去掉 update 兼容 create

* 添加 unread total 接口

* 调整json字段

Co-authored-by: xinwen <coderWen@126.com>

apps/notifications/backends/email.py

@@ -0,0 +1,14 @@
+from django.conf import settings
+from django.core.mail import send_mail
+
+from .base import BackendBase
+
+
+class Email(BackendBase):
+    account_field = 'email'
+    is_enable_field_in_settings = 'EMAIL_HOST_USER'
+
+    def send_msg(self, users, subject, message):
+        from_email = settings.EMAIL_FROM or settings.EMAIL_HOST_USER
+        accounts, __, __ = self.get_accounts(users)
+        send_mail(subject, message, from_email, accounts)