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.

apps/bot/prisma/schema.prisma

@@ -914,6 +914,18 @@ model BotPresenceConfig {
   updatedAt          DateTime @updatedAt
 }
 
+/// Global `/about` message (Owner panel). Singleton row id = "singleton".
+model BotAboutConfig {
+  id          String   @id @default("singleton")
+  enabled     Boolean  @default(true)
+  /// TEXT | EMBED | COMPONENTS_V2
+  messageType String   @default("EMBED")
+  content     String?
+  embed       Json?
+  components  Json?
+  updatedAt   DateTime @updatedAt
+}
+
 model ChangelogEntry {
   id          String   @id @default(cuid())
   version     String