feat: refactor service organization and update imports

- Introduced a new structure for services in `src/services/` to improve organization by domain, including core, analytics, data management, integrations, and task management.
- Moved relevant files to their new locations and updated all internal and external imports accordingly.
- Updated `TODO.md` to reflect the new service organization and outlined phases for further refactoring.

src/components/settings/SettingsIndexPageClient.tsx

@@ -6,7 +6,7 @@ import { useState, useEffect, useTransition } from 'react';
 import { backupClient } from '@/clients/backup-client';
 import { jiraClient } from '@/clients/jira-client';
 import { getSystemInfo } from '@/actions/system-info';
-import { SystemInfo } from '@/services/system-info';
+import { SystemInfo } from '@/services/core/system-info';
 import { QuickStats } from './index/QuickStats';
 import { SettingsNavigation } from './index/SettingsNavigation';
 import { QuickActions } from './index/QuickActions';