feat(pl): add archive zip naming helpers and planId on export rows.

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

backend/tests/test_pl_plan_archive_zip_export.py

@@ -0,0 +1,33 @@
+from app.services.pl_plan_archive_zip_export import (
+    sanitize_zip_segment,
+    short_hash,
+    build_attachment_filename,
+    first_row_no_by_plan_id,
+    build_hyperlink_formula,
+)
+
+
+def test_sanitize_zip_segment():
+    assert sanitize_zip_segment("装货·司机/A") == "装货·司机_A"
+    assert sanitize_zip_segment("  a  ") == "a"
+
+
+def test_build_attachment_filename():
+    name = build_attachment_filename(1, "装货·司机", "https://cdn.example/path/a.jpg")
+    assert name.startswith("01_装货·司机_")
+    assert name.endswith(".jpg")
+
+
+def test_first_row_no_by_plan_id():
+    rows = [
+        {"planId": "p1", "rowNo": 1},
+        {"planId": "p1", "rowNo": 2},
+        {"planId": "p2", "rowNo": 3},
+    ]
+    assert first_row_no_by_plan_id(rows) == {"p1": 1, "p2": 3}
+
+
+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