Enhance bot and WebUI functionality with new features and environment updates

- Added support for new environment variables in `.env.example` for public site and legal operator information.
- Integrated core commands into the bot's command structure for improved functionality.
- Implemented a new `publishBotStatus` function to update bot status in Redis, enhancing monitoring capabilities.
- Updated the landing page to include features, invite links, and support server access, improving user experience.
- Enhanced localization with new keys for core commands and landing page elements in both English and German.
- Improved error handling and logging for bot presence updates and status publishing.

.env.example

@@ -25,3 +25,10 @@ WEBUI_URL=http://10.111.0.65:3000
 SESSION_SECRET=
 # Comma-separated Discord user IDs treated as global bot owners (owner panel, Phase 7 Batch C).
 OWNER_USER_IDS=
+
+# Public site / bot links (Phase 8)
+SUPPORT_SERVER_URL=
+LEGAL_OPERATOR_NAME=
+LEGAL_OPERATOR_ADDRESS=
+LEGAL_OPERATOR_EMAIL=
+LEGAL_OPERATOR_PHONE=