v2.4.3: Replace Discord links with Community Chat & Telegram

Discord server was DMCA'd. All Discord links replaced with:
- Community Chat (Stoat): chat.sanhost.net
- Telegram Channel: @hf2p_og
- Telegram Group: @sanhostnet

Launcher UI: added community links on main screen, renamed
Discord nav to Community Chat, updated popup modal.

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

.github/ISSUE_TEMPLATE/support_request.yml

@@ -22,7 +22,7 @@ body:
       value: |
         If you need help or support with using the launcher, please fill out this support request.
         Provide as much detail as possible so we can assist you effectively.
-        **Need a quick assistance?** Please Open-A-Ticket in our [Discord Server](https://discord.gg/Fhbb9Yk5WW)!
+        **Need a quick assistance?** Join our [Community Chat](https://chat.sanhost.net/invite/Tfz4jCK4) or [Telegram](https://t.me/hf2p_og)!
 
   - type: textarea
     id: question