feat: add Stat-Check ELO column with daily auto-refresh

- Scraper (statcheck-elo-scraper/refresh_elo.py) downloads the stat-check
  ELO workbook from OneDrive and builds public/elo-data.json
- GitHub Actions workflow (.github/workflows/refresh-elo.yml) runs daily
  at 06:00 UTC and commits updated ELO data
- Frontend fetches elo-data.json and matches players by name, using BCP
  career event history to disambiguate same-name candidates
- ELO score shown in new sortable Stat-Check ELO column, visible on all
  screen sizes; unmatched players show —

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

index.html

@@ -76,6 +76,7 @@
               <th class="text-right hidden sm:table-cell cursor-pointer select-none" data-sort="wlt">W–L–T</th>
               <th class="text-right hidden sm:table-cell cursor-pointer select-none" data-sort="wpct">Win %</th>
               <th class="text-right hidden sm:table-cell cursor-pointer select-none" data-sort="rank">ITC Rank</th>
+              <th class="text-center cursor-pointer select-none" data-sort="elo">Stat-Check ELO</th>
             </tr>
           </thead>
           <tbody id="rows"></tbody>