list_bans() was calling geo_service.lookup() once per IP on the
page (e.g. 100 sequential HTTP requests), hitting the ip-api.com
free-tier single-IP limit of 45 req/min. IPs beyond the ~45th
were added to the in-process negative cache (5 min TTL) and showed
as no country until the TTL expired. The map endpoint never had
this problem because it used lookup_batch (100 IPs per POST).
Add http_session and app_db params to list_bans(). When
http_session is provided (production path), the entire page is
resolved in one lookup_batch() call instead of N individual ones.
The legacy geo_enricher callback is kept for test compatibility.
Update the dashboard router to use the batch path directly.
Adds 3 tests covering the batch geo path, failure resilience, and
http_session priority over geo_enricher.
Lukas
0225f32901