fix(recap): speed up /card lookup, fix stale completed-season cache, add Place Finished

- /card player lookup was a leading-wildcard substring match with a Python
  ulower() UDF over 6.16M player_games_hist rows — a full scan measured at
  27s live before the ~2s render. Add a prefix fast-path
  (nick LIKE 'name%' COLLATE NOCASE) that uses the existing NOCASE index
  (~1ms), falling back to the ulower substring scan only when the prefix
  finds nothing. Same fix applied to _resolve_player_uids_batch (compare/stats).
  Lookup: 27,205ms -> 1ms.

- Completed-season recap cache served ANY cached PNG forever, including files
  rendered mid-season (frozen at whatever point they were last viewed). Only
  serve from cache when the file's mtime is after season end; otherwise
  re-render. Fixed in both BOT/utils.py and web/server.js (shared cache).

- Replace squadron card "Rating change" with "Place finished" (#rank / total),
  derived by ranking clans by final total_score among those active in-season.

- Add (CARD)/(RECAP) timing logs for prod observability.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/locales/en.json

@@ -702,6 +702,7 @@
     "imgAxisWinRate": "Win Rate (%)",
     "imgStatPeakRating": "Peak rating",
     "imgStatRatingChange": "Rating change",
+    "imgStatPlaceFinished": "Place finished",
     "imgStatTotalKills": "Total kills",
     "imgStatTotalDeaths": "Total deaths",
     "imgStatAssistsCaptures": "Assists / captures",