产物下载失败信息补上可诊断上下文

- 传输失败带上脱敏 URL 与底层错误 source 链
- 非成功状态补上状态码文案与脱敏 URL

server-rs/crates/platform-tripo/src/common/client.rs

@@ -110,15 +110,22 @@ impl TripoProviderClient {
         .map_err(|_elapsed| artifact_stall_error(task_id, self.artifact_stall_timeout))?
         .map_err(|error| TripoError::Request {
             message: format!(
-                "artifact download transport failure for task {task_id}: {}",
-                transport_error_kind(&error)
+                "artifact download transport failure for task {task_id}: {} from {} ({})",
+                transport_error_kind(&error),
+                url.redacted(),
+                transport_error_source(&error),
             ),
             status: None,
         })?;
         let status = response.status();
         if !status.is_success() {
             return Err(TripoError::Request {
-                message: format!("artifact download failed for task {task_id}"),
+                message: format!(
+                    "artifact download failed for task {task_id}: {} {} ({})",
+                    status.as_u16(),
+                    status.canonical_reason().unwrap_or("unknown status"),
+                    url.redacted(),
+                ),
                 status: Some(status.as_u16()),
             });
         }
@@ -183,6 +190,13 @@ fn transport_error_kind(error: &reqwest::Error) -> &'static str {
     }
 }
 
+/// reqwest 的 `Display` 会带上完整 URL（含签名参数），排障只取 source 链。
+fn transport_error_source(error: &reqwest::Error) -> String {
+    std::error::Error::source(error)
+        .map(|source| source.to_string())
+        .unwrap_or_else(|| "no source detail".to_string())
+}
+
 #[cfg(test)]
 mod tests {
     use std::net::SocketAddr;