fix: path traversal via URL-encoded ../, Feb 29 leap year crash, missing response_model, dead code, duplicate utcnow

api/app/schemas/account.py

@@ -82,6 +82,14 @@ class AccountHistoryResponse(BaseModel):
         from_attributes = True
 
 
+class PaginatedAccountHistoryResponse(BaseModel):
+    """分页账户变更历史响应模型"""
+    total: int
+    page: int
+    page_size: int
+    records: List[AccountHistoryResponse] = []
+
+
 # ============ 分期还款计划 Schema ============
 
 class DebtInstallmentBase(BaseModel):