feat(regulatory): 增加法规核查基础服务

tests/test_regulatory_text_extract.py

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+from pathlib import Path
+
+from review_agent.regulatory_review.services.text_extract import extract_text
+
+
+def test_extract_text_reads_plain_text(tmp_path):
+    path = tmp_path / "说明书.txt"
+    path.write_text("产品名称：甲胎蛋白检测试剂盒\n储存条件：2-8℃", encoding="utf-8")
+
+    result = extract_text(path)
+
+    assert "甲胎蛋白" in result.text
+    assert result.status == "success"
+    assert result.content_hash
+
+
+def test_extract_text_reports_unsupported_file(tmp_path):
+    path = tmp_path / "image.png"
+    path.write_bytes(b"png")
+
+    result = extract_text(path)
+
+    assert result.status == "unsupported"
+    assert result.text == ""