Update README and moderation commands for localization and migration support

- Revised README to include database migration steps and a new section for database management.
- Enhanced moderation command responses to utilize localized messages for unknown commands.
- Refactored moderation commands to use centralized command data definitions, improving maintainability and consistency.
- Added localization support for command descriptions and options in both German and English.
- Versioned Prisma migrations for better tracking of database changes.

packages/shared/src/discord-localization.test.ts

@@ -0,0 +1,17 @@
+import { describe, expect, it } from 'vitest';
+import { commandLocale, localizedChoice } from './discord-localization.js';
+
+describe('discord localization helpers', () => {
+  it('maps command locales to Discord localization keys', () => {
+    const locale = commandLocale('moderation.ban.description');
+    expect(locale.description).toBe('Ban a user');
+    expect(locale.descriptionLocalizations.de).toBe('Bannt einen Nutzer');
+    expect(locale.descriptionLocalizations['en-US']).toBe('Ban a user');
+  });
+
+  it('maps choice labels with localizations', () => {
+    const choice = localizedChoice('moderation.choice.ban', 'BAN');
+    expect(choice.value).toBe('BAN');
+    expect(choice.name_localizations?.de).toBe('Ban');
+  });
+});