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/services/jira.ts

@@ -4,7 +4,7 @@
  */
 
 import { JiraTask } from '@/lib/types';
-import { prisma } from './database';
+import { prisma } from './core/database';
 import { parseDate, formatDateForDisplay } from '@/lib/date-utils';
 
 export interface JiraConfig {