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.

apps/bot/src/commands.ts

@@ -1,6 +1,8 @@
 import { REST, Routes, type ChatInputCommandInteraction } from 'discord.js';
+import { t } from '@nexumi/shared';
 import { env } from './env.js';
 import { logger } from './logger.js';
+import { getGuildLocale } from './i18n.js';
 import { moderationCommands } from './modules/moderation/commands.js';
 import type { BotContext, SlashCommand } from './types.js';
 
@@ -17,8 +19,9 @@ export async function registerCommands() {
 
 export async function routeCommand(interaction: ChatInputCommandInteraction, context: BotContext) {
   const command = map.get(interaction.commandName);
+  const locale = await getGuildLocale(context.prisma, interaction.guildId);
   if (!command) {
-    await interaction.reply({ content: 'Unknown command.', ephemeral: true });
+    await interaction.reply({ content: t(locale, 'generic.unknownCommand'), ephemeral: true });
     return;
   }
   await command.execute(interaction, context);