feat(lol): replace schedule source with PandaScore API

Swap the lol module upstream from the lolesports.com gql persisted-query
client to PandaScore REST (/lol/matches, Bearer LOL_PANDASCORE_TOKEN,
free tier 1000 req/h). The gql transport broke whenever Riot redeployed
their frontend; PandaScore is a stable versioned contract.

ScheduleEvent, formatters, cron, and the bson cache shape are unchanged:
only the transport and response mapping moved. PandaScore league slugs
canonicalize to the existing major-league allowlist; results join to
opponents by team_id so reversed arrays cannot swap scores; outcomes are
declared only once upstream commits a winner, preserving the
score-pending rendering. A still-full final page now logs
lol_page_budget_exhausted and the live page budget covers 500 raw
matches per window.

Missing token short-circuits with lol_token_missing before any upstream
call; the 60-minute stale cache still covers outages. Document the new
env var and cancel the superseded Leaguepedia score-enrichment plan.

.env.example

@@ -24,6 +24,11 @@ ADMIN_IDS=
 # Commit in Build" disabled so Docker layer cache survives across commits.
 # Local `docker compose up` has none, so deploynotify reports "unknown".
 
+# PandaScore API token for the lol module's schedule fetches (free tier at
+# https://app.pandascore.co/dashboard, no credit card). Secret — never logged.
+# Without it every /lol* fetch fails; the stale cache covers ≤60 min.
+LOL_PANDASCORE_TOKEN=
+
 # Optional /wheelofnames GIF renderer. Standard deployment:
 # https://github.com/tiennm99/wheelofnames. Leave blank to fall back to text
 # selection.