Enhance Prisma schema and documentation for dashboard features

- Added new models for DashboardAccessRule and DashboardAuditLog to the Prisma schema, improving access control and logging capabilities.
- Updated GuildSettings model to include timezone support.
- Revised PHASE-TRACKING.md to reflect the completion of Phase 5 and outline upcoming Phase 6 features, including dashboard layout and settings framework.
- Exported new phase 6 features in shared index for better modularity.

apps/webui/next.config.ts

@@ -0,0 +1,10 @@
+import path from 'path';
+import type { NextConfig } from 'next';
+
+const nextConfig: NextConfig = {
+  output: 'standalone',
+  transpilePackages: ['@nexumi/shared'],
+  outputFileTracingRoot: path.join(__dirname, '../..')
+};
+
+export default nextConfig;