对齐讲解业务单元静态数据口径

- 刷新讲解静态数据包并保留完整 outline 树
- 按后台顶层业务单元口径归并讲解点统计
- 更新讲解静态数据刷新操作文档

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/export-guide-static-data.py

@@ -496,8 +496,10 @@ def export_package(config_path: Path, output_dir: Path, nav_assets_dir: Path) ->
         output_dir.mkdir(parents=True, exist_ok=True)
         data: dict[str, list[dict[str, Any]]] = {}
         for table, file_stem in TABLES.items():
-            rows = fetch_table(connection, schema, table)
-            data[file_stem] = rows
+            data[file_stem] = fetch_table(connection, schema, table)
+
+        for table, file_stem in TABLES.items():
+            rows = data[file_stem]
             write_json(
                 output_dir / f"{file_stem}.json",
                 {