fix: resolve all lint errors across codebase

- Convert CacheTTL enum to const object to fix duplicate value errors
- Fix import ordering in test files (eslint-disable for vi.mock pattern)
- Fix unused variable warnings (prefix with underscore)
- Auto-fix import ordering in subscription page, dashboard layout
- 0 lint errors remaining

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/app/(dashboard)/layout.tsx

@@ -2,8 +2,8 @@
 
 import Link from 'next/link';
 import { usePathname } from 'next/navigation';
-import { Button } from '@/components/ui/button';
 import { useTheme } from '@/components/providers/theme-provider';
+import { Button } from '@/components/ui/button';
 import { useAuthStore } from '@/lib/auth-store';
 import { cn } from '@/lib/utils';