feat(pl): collect hazard certs for archive zip export.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_pl_plan_archive_zip_export.py

@@ -3,6 +3,9 @@ from app.services.pl_plan_archive_zip_export import (
     build_attachment_filename,
     first_row_no_by_plan_id,
     build_hyperlink_formula,
+    parse_url_list,
+    collect_hazard_cert_items,
+    merge_plan_attachment_items,
 )
 
 
@@ -30,3 +33,30 @@ def test_build_hyperlink_formula():
     f = build_hyperlink_formula("附件/01_司机_ab12.jpg", "司机")
     assert f.startswith('=HYPERLINK(')
     assert "附件/01_司机_ab12.jpg" in f
+
+
+def test_parse_url_list_csv_and_json():
+    assert parse_url_list("a.jpg,b.jpg") == ["a.jpg", "b.jpg"]
+    assert parse_url_list('["x.png","y.png"]') == ["x.png", "y.png"]
+
+
+def test_collect_hazard_cert_items_labels():
+    class P:
+        product_name = "甲醇"
+        purchase_cert_url = "https://x/p.pdf"
+        transport_cert_url = None
+        legal_use_cert_url = "https://x/l1.pdf,https://x/l2.pdf"
+
+    items = collect_hazard_cert_items([P()])
+    labels = [i["label"] for i in items]
+    assert "购买证" in labels[0]
+    assert any("合法使用证明" in x for x in labels)
+    assert len(items) == 3
+
+
+def test_merge_dedupes_url():
+    doc = [{"url": "https://a/1.jpg", "label": "司机"}]
+    haz = [{"url": "https://a/1.jpg", "label": "购买证"}]
+    merged = merge_plan_attachment_items(doc, haz)
+    assert len(merged) == 1
+    assert merged[0]["label"] == "司机"