fix(scripts): HTTP 错误带上响应体

raise_for_status 只给一行 URL，而 Label Studio 把真正原因写在响应体里。
批量导入返回 500 时看不到任何线索，排查只能靠猜。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/push_predictions.py

@@ -87,7 +87,12 @@ class LabelStudio:
         if response.status_code == 401:
             self._authorize()
             response = self.session.request(method, f"{self.url}{path}", **kwargs)
-        response.raise_for_status()
+        if response.status_code >= 400:
+            # 带上响应体：Label Studio 的 4xx/5xx 常把真正原因写在里面，
+            # raise_for_status 只给一行 URL，排查时毫无用处
+            raise RuntimeError(
+                f"{method} {path} 失败 HTTP {response.status_code}：{response.text[:500]}"
+            )
         return response
 
     def tasks(self, project: int, page_size: int = 500) -> list[dict]:
@@ -292,11 +297,19 @@ def main() -> int:
             total_boxes += len(boxes)
             with_boxes += bool(boxes)
         if len(pending) >= args.chunk:
+            try:
                 flush()
+            except RuntimeError as exc:
+                logger.error("%s", exc)
+                return 1
         processed = start + len(chunk)
         if processed % 1000 < args.batch:
             logger.info("处理 [%d/%d]，已上传 %d", processed, len(pairs), uploaded)
+    try:
         flush()
+    except RuntimeError as exc:
+        logger.error("%s", exc)
+        return 1
 
     logger.info(
         "完成：%d 个任务，%d 个有框（%d 个框），上传 %d 条预测，版本 %s",

tests/test_push_predictions.py

@@ -169,3 +169,11 @@ def test_predictions_endpoint_is_not_paginated():
     methods = [method for method, _, _ in session.requests]
     assert methods == ["GET", "DELETE", "DELETE"]      # 只列一次，删两条
     assert session.requests[1][1] == "http://ls/api/predictions/1/"
+
+
+def test_http_errors_include_the_response_body():
+    """Label Studio 把真正原因写在响应体里，只抛 URL 没法排查。"""
+    session = _TokenSession(statuses=[500], payload={"detail": "boom"})
+    client = _client(session)
+    with pytest.raises(RuntimeError, match="HTTP 500.*boom"):
+        client.request("POST", "/api/projects/39/import/predictions", json=[])