新增: F-04多Provider负载均衡池(数据层+选择器+并发原语)+CR-52白项

crates/df-storage/src/secret.rs

@@ -211,6 +211,7 @@ mod tests {
             api_key: "sk-db-fallback".into(), base_url: "https://x".into(),
             default_model: "m".into(), models: None, model_configs: Vec::new(), is_default: false,
             config: None, created_at: "0".into(), updated_at: "0".into(),
+            enabled: true, weight: 50,
         };
         assert_eq!(resolve_provider_secret(&rec), "sk-db-fallback");
     }