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)/dashboard/subscription/page.tsx

@@ -1,7 +1,7 @@
 'use client';
 
-import { useState } from 'react';
 import { useQueryClient } from '@tanstack/react-query';
+import { useState } from 'react';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';