fix: tenant_id str → int 匹配 DB 类型

backend/app/plugin/module_payment/expense/institution/schema.py

@@ -30,6 +30,6 @@ class InstitutionListOutSchema(InstitutionCreateSchema):
 
     model_config = ConfigDict(from_attributes=True)
 
-    tenant_id: str = Field(description="租户ID")
+    tenant_id: int = Field(description="租户ID")
     created_time: datetime | None = Field(default=None, description="创建时间")
     updated_time: datetime | None = Field(default=None, description="修改时间")