feat: add backend i18n response support

app/schemas/response.py

@@ -1,12 +1,29 @@
 from typing import Optional, Union
 
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, model_validator
+
+from app.helper.locale import LocaleHelper
 
 
 class Response(BaseModel):
+    """通用接口响应结构"""
+
     # 状态
     success: bool
     # 消息文本
     message: Optional[str] = None
+    # 多语言消息文本
+    message_i18n: Optional[str] = None
     # 数据
     data: Optional[Union[dict, list]] = Field(default_factory=dict)
+
+    @model_validator(mode="after")
+    def fill_message_i18n(self) -> "Response":
+        """
+        自动补充响应消息的多语言文本。
+        """
+        if self.message and self.message_i18n is None:
+            self.message_i18n = LocaleHelper.translate_text(
+                self.message, locale=LocaleHelper.get_current_locale()
+            )
+        return self