Add collapsible Team Help chat widget on all public pages

Self-contained assistant (no external services) with a knowledge base
covering the strategy, levels, costs, wallet setup, funding, joining,
training videos, and live current-sponsor/queue data; falls back to
the configured Telegram group link when it can't answer.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

public/training.html

@@ -21,4 +21,4 @@
 </div></section>
 </main>
 <footer class="wrap disclaimer">This is an independent Crypto Team Build training resource. Always confirm transaction details in your wallet before signing. Never disclose your Secret Recovery Phrase.<div class="footer-links"><a href="/">Strategy</a><a href="/start">Getting Started</a><a href="/admin">Team Admin</a></div></footer>
-<script src="/track.js"></script><script src="/training.js"></script></body></html>
+<script src="/track.js"></script><script src="/training.js"></script><script src="/chat.js" defer></script></body></html>