fix: pass subscription_key and endpoint in bing.py CLI search_bing() call (#24768)

The __main__ block called search_bing() with 4 positional arguments, but
the function requires 5 (subscription_key, endpoint, locale, query,
count). Running `python -m open_webui.retrieval.web.bing` raised a
TypeError and, before failing, silently misrouted every argument. Read
the key/endpoint from environment variables, matching config.py defaults.

Closes #24765

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/open_webui/retrieval/web/bing.py

@@ -64,5 +64,14 @@ def main():
 
     args = parser.parse_args()
 
-    results = search_bing(args.locale, args.query, args.count, args.filter)
+    results = search_bing(
+        os.environ.get('BING_SEARCH_V7_SUBSCRIPTION_KEY', ''),
+        os.environ.get(
+            'BING_SEARCH_V7_ENDPOINT', 'https://api.bing.microsoft.com/v7.0/search'
+        ),
+        args.locale,
+        args.query,
+        args.count,
+        args.filter,
+    )
     pprint(results)