feat: batch update - gift card breakdown spec, backend APIs, miniprogram pages, ETL finance recharge, docs & migrations

apps/backend/app/schemas/base.py

@@ -0,0 +1,17 @@
+from pydantic import BaseModel, ConfigDict
+from pydantic.alias_generators import to_camel
+
+
+class CamelModel(BaseModel):
+    """所有小程序 API 响应 schema 的基类。
+
+    - alias_generator=to_camel：JSON 输出字段名自动转 camelCase
+    - populate_by_name=True：同时接受 snake_case 和 camelCase 输入
+    - from_attributes=True：支持从 ORM 对象/dict 构造
+    """
+
+    model_config = ConfigDict(
+        alias_generator=to_camel,
+        populate_by_name=True,
+        from_attributes=True,
+    )