fix: restore the wiki alignment check, which no longer imported

The telemetry column list was renamed from _COLUMNS to COLUMNS at some
point and this tool was never updated, so make wiki-check has been dying
on an ImportError rather than checking anything. One line.

It still reports every page as missing, but that is the documentation
site being taken down in August, not a fault in the check.

tools/check_wiki_alignment.py

@@ -28,7 +28,7 @@ from polygateway import EmbeddingClient, GatewayClient, LLMResponse
 from polygateway.config import _SOURCE_FIELDS
 from polygateway.ocr import OcrClient
 from polygateway.providers import register_provider
-from polygateway.telemetry.sqlite import _COLUMNS as TELEMETRY_COLUMNS
+from polygateway.telemetry.sqlite import COLUMNS as TELEMETRY_COLUMNS
 
 # 参数名允许在 wiki 里以别名出现的白名单(仅限确无歧义的自解释形参)
 _PARAM_ALIASES: dict[str, set[str]] = {"env": {"env"}}