Add global /about command and configuration

- Introduced `BotAboutConfig` model for managing the global `/about` message in the owner panel.
- Implemented the `/about` command with localization support and integrated it into the help catalog.
- Enhanced the dashboard with a new owner section for configuring the `/about` message type and content.
- Updated components to handle the new command and its interactions, including support for different message formats (TEXT, EMBED, COMPONENTS_V2).
- Added localization entries for the `/about` command in English and German, improving accessibility for users.
- Documented the implementation in the phase tracking documentation for future reference.

packages/shared/src/command-locales.ts

@@ -1455,6 +1455,10 @@ export const commandLocales = {
     de: 'Bot-Info: Version, Uptime, Shard, Links',
     en: 'Bot info: version, uptime, shard, links'
   },
+  'core.about.description': {
+    de: 'Über Nexumi',
+    en: 'About Nexumi'
+  },
   'core.invite.description': {
     de: 'Einladungslink für Nexumi',
     en: 'Invite link for Nexumi'