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/owner.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect, it } from 'vitest';
 import {
+  BotAboutConfigSchema,
   BotPresenceConfigSchema,
   FeatureFlagUpsertSchema,
   ownerRoleAtLeast,
@@ -19,6 +20,17 @@ describe('owner schemas', () => {
     expect(parsed.activityText).toBe('nexumi.de');
   });
 
+  it('parses about config', () => {
+    const parsed = BotAboutConfigSchema.parse({
+      enabled: true,
+      messageType: 'EMBED',
+      content: null,
+      embed: { title: 'About', description: 'Nexumi', color: 0x6366f1 },
+      components: null
+    });
+    expect(parsed.embed?.title).toBe('About');
+  });
+
   it('ranks owner roles', () => {
     expect(ownerRoleAtLeast('ADMIN', 'SUPPORT')).toBe(true);
     expect(ownerRoleAtLeast('VIEWER', 'ADMIN')).toBe(false);