Clarify official and feature categories

scripts/extract_catalog.py

@@ -142,6 +142,12 @@ def main() -> None:
     with pdfplumber.open(PDF_PATH) as pdf:
         for page_number, page in enumerate(pdf.pages, 1):
             category = CATEGORY_BY_PAGE[page_number]
+            page_text = clean(page.extract_text() or "")
+            expected_heading = f"{category}产品明细表"
+            if expected_heading not in page_text:
+                raise RuntimeError(
+                    f"Category heading mismatch on page {page_number}: expected {expected_heading}"
+                )
             tables = page.find_tables()
             if not tables:
                 raise RuntimeError(f"No table found on page {page_number}")