实现Agent对话，合格自动提交，不合格补充材料的能力

tests/test_llm_extractor.py

@@ -1,7 +1,7 @@
 """LLM 信息提取模块单元测试
 
 覆盖范围：
-- _parse_json_response：纯 JSON、Markdown 包裹、带前缀、解析失败
+- `parse_json_response`：纯 JSON、Markdown 包裹、带前缀、解析失败
 - _image_to_base64：图片转 base64
 - extract_document：成功提取、LLM 失败
 """
@@ -16,8 +16,8 @@ import pytest
 
 from src.doc.llm_extractor import (
     _image_to_base64,
-    _parse_json_response,
     extract_document,
+    parse_json_response,
 )
 
 # 字段键名（与源码中的字符串字面量保持一致）
@@ -28,7 +28,7 @@ K_CARD_NO = "card_no"
 K_CARD_AMOUNT = "card_amount"
 
 # ------------------------------------------------------------------
-# _parse_json_response
+# parse_json_response
 # ------------------------------------------------------------------
 
 
@@ -37,47 +37,47 @@ class TestParseJsonResponse:
 
     def test_pure_json(self):
         raw = json.dumps({K_INVOICE_NUMBER: "123456", K_TOTAL_AMOUNT: "100.00"})
-        result = _parse_json_response(raw)
+        result = parse_json_response(raw)
         assert result[K_INVOICE_NUMBER] == "123456"
         assert result[K_TOTAL_AMOUNT] == "100.00"
 
     def test_markdown_json_block(self):
         raw = f'```json\n{{"{K_INVOICE_NUMBER}": "789"}}\n```'
-        result = _parse_json_response(raw)
+        result = parse_json_response(raw)
         assert result[K_INVOICE_NUMBER] == "789"
 
     def test_markdown_block_without_lang(self):
         raw = '```\n{"key": "value"}\n```'
-        result = _parse_json_response(raw)
+        result = parse_json_response(raw)
         assert result["key"] == "value"
 
     def test_json_prefix(self):
         raw = f'json\n{{"{K_INVOICE_NUMBER}": "001"}}'
-        result = _parse_json_response(raw)
+        result = parse_json_response(raw)
         assert result[K_INVOICE_NUMBER] == "001"
 
     def test_json_prefix_with_whitespace(self):
         raw = '  json  \n{"a": 1}'
-        result = _parse_json_response(raw)
+        result = parse_json_response(raw)
         assert result["a"] == 1
 
     def test_nested_json(self):
         raw = json.dumps({"outer": {"inner": [1, 2, 3]}})
-        result = _parse_json_response(raw)
+        result = parse_json_response(raw)
         assert result["outer"]["inner"] == [1, 2, 3]
 
     def test_whitespace_around_json(self):
         raw = '  \n  {"x": 42}  \n  '
-        result = _parse_json_response(raw)
+        result = parse_json_response(raw)
         assert result["x"] == 42
 
     def test_invalid_json_raises(self):
         with pytest.raises(ValueError):
-            _parse_json_response("not json at all")
+            parse_json_response("not json at all")
 
     def test_empty_string_raises(self):
         with pytest.raises(ValueError):
-            _parse_json_response("")
+            parse_json_response("")
 
 
 # ------------------------------------------------------------------