fix: stabilize backend services and frontend pointer

tests/test_page_quality_vlm.py

@@ -0,0 +1,58 @@
+import pytest
+
+from fastapi_modules.fastapi_leaudit.services.impl.pageQualityServiceImpl import PageQualityServiceImpl
+
+
+class _FakeVlmClient:
+    def __init__(self, response):
+        self.response = response
+        self.prompts = []
+
+    async def extract_multifield(self, *, prompt, images_data_urls, max_tokens=800):
+        self.prompts.append((prompt, images_data_urls, max_tokens))
+        if isinstance(self.response, Exception):
+            raise self.response
+        return self.response
+
+
+@pytest.mark.asyncio
+async def test_vlm_page_quality_reject_result_is_used():
+    service = PageQualityServiceImpl()
+    service.VlmClient = _FakeVlmClient(
+        {
+            "status": "reject",
+            "score": 0.18,
+            "reason": "页面文字严重模糊，无法稳定辨认关键内容",
+        }
+    )
+
+    status, score, reason = await service._classify_page_image_by_vlm(b"image-bytes")
+
+    assert status == "reject"
+    assert score == 0.18
+    assert "严重模糊" in reason
+    assert "只输出 JSON" in service.VlmClient.prompts[0][0]
+
+
+@pytest.mark.asyncio
+async def test_vlm_page_quality_invalid_result_falls_back_to_review_not_pass():
+    service = PageQualityServiceImpl()
+    service.VlmClient = _FakeVlmClient({"status": "unknown", "reason": ""})
+
+    status, score, reason = await service._classify_page_image_by_vlm(b"image-bytes")
+
+    assert status == "review"
+    assert score == 0.5
+    assert "VLM返回结果不可用" in reason
+
+
+@pytest.mark.asyncio
+async def test_vlm_page_quality_error_falls_back_to_review_not_pass():
+    service = PageQualityServiceImpl()
+    service.VlmClient = _FakeVlmClient(RuntimeError("vlm down"))
+
+    status, score, reason = await service._classify_page_image_by_vlm(b"image-bytes")
+
+    assert status == "review"
+    assert score == 0.5
+    assert "VLM图片质量检测失败" in reason