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/vitest.config.ts

@@ -1,5 +1,5 @@
-import react from '@vitejs/plugin-react';
 import path from 'path';
+import react from '@vitejs/plugin-react';
 import { defineConfig } from 'vitest/config';
 
 export default defineConfig({