Implement premium features and GDPR compliance in bot and WebUI

- Added new models for premium tier configurations and assignments, enabling feature limits for free and premium users.
- Introduced GDPR deletion logging and commands for user data management.
- Enhanced logging configuration with retention days for audit logs.
- Updated bot commands and job processing to include new premium and GDPR functionalities.
- Improved localization with new keys for premium features and GDPR commands in both English and German.
- Added UI components for managing premium settings and logging retention in the WebUI.

apps/webui/src/app/owner/premium/page.tsx

@@ -0,0 +1,40 @@
+import type { PremiumTierConfig } from '@nexumi/shared';
+import { PremiumManager } from '@/components/owner/premium-manager';
+import { getLocale, t } from '@/lib/i18n';
+import { ensurePremiumTierConfigs } from '@/lib/premium';
+import { prisma } from '@/lib/prisma';
+
+export default async function OwnerPremiumPage() {
+  const [locale, tiers, guilds, users] = await Promise.all([
+    getLocale(),
+    ensurePremiumTierConfigs(prisma),
+    prisma.guildPremiumAssignment.findMany({ orderBy: { updatedAt: 'desc' } }),
+    prisma.userPremiumAssignment.findMany({ orderBy: { updatedAt: 'desc' } })
+  ]);
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-2xl font-semibold">{t(locale, 'owner.premium.title')}</h1>
+        <p className="text-sm text-muted-foreground">{t(locale, 'owner.premium.subtitle')}</p>
+      </div>
+      <PremiumManager
+        initialTiers={tiers as PremiumTierConfig[]}
+        initialGuilds={guilds.map((row) => ({
+          id: row.id,
+          guildId: row.guildId,
+          tier: row.tier,
+          note: row.note,
+          expiresAt: row.expiresAt?.toISOString() ?? null
+        }))}
+        initialUsers={users.map((row) => ({
+          id: row.id,
+          userId: row.userId,
+          tier: row.tier,
+          note: row.note,
+          expiresAt: row.expiresAt?.toISOString() ?? null
+        }))}
+      />
+    </div>
+  );
+}