feat: AI Kurzy module, project/service documents, services SQL import

- Add AI Kurzy module with courses, participants, and registrations management
- Add project documents and service documents features
- Add service folders for document organization
- Add SQL import queries for services from firmy.slovensko.ai
- Update todo notifications and group messaging
- Various API improvements and bug fixes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

sql/03_cleanup_data.sql

@@ -0,0 +1,82 @@
+-- ============================================================
+-- CLEANUP DATA - Clear test/development data
+-- WARNING: This will DELETE data! Use with caution!
+-- ============================================================
+
+-- ============================================================
+-- OPTION 1: SOFT CLEANUP (keeps structure, removes data)
+-- ============================================================
+
+-- Clear Todos and related
+DELETE FROM todo_users;
+DELETE FROM todos;
+
+-- Clear Companies and related
+DELETE FROM company_remind;
+DELETE FROM company_users;
+DELETE FROM company_documents;
+DELETE FROM companies;
+
+-- Clear Projects and related
+DELETE FROM project_users;
+DELETE FROM project_documents;
+DELETE FROM projects;
+
+-- Clear Notes
+DELETE FROM notes;
+
+-- Clear Time Entries
+DELETE FROM time_entries;
+
+-- Clear Timesheets
+DELETE FROM timesheets;
+
+-- Clear Events and related
+DELETE FROM event_users;
+DELETE FROM events;
+
+-- Clear Messages (both direct and group)
+DELETE FROM messages;
+DELETE FROM group_messages;
+DELETE FROM chat_group_members;
+DELETE FROM chat_groups;
+
+-- Clear Services
+DELETE FROM service_documents;
+DELETE FROM service_folders;
+DELETE FROM services;
+
+-- Clear Email related (contacts, emails) - BE CAREFUL
+-- DELETE FROM emails;
+-- DELETE FROM contacts;
+
+-- Clear Push subscriptions
+DELETE FROM push_subscriptions;
+
+-- Clear Email signatures
+DELETE FROM email_signatures;
+
+-- ============================================================
+-- OPTION 2: RESET SEQUENCES (optional)
+-- ============================================================
+
+-- If you have serial IDs and want to reset them:
+-- ALTER SEQUENCE todos_id_seq RESTART WITH 1;
+-- etc.
+
+-- ============================================================
+-- VERIFY CLEANUP
+-- ============================================================
+
+SELECT 'Cleanup results:' as info;
+SELECT 'Todos:' as table_name, COUNT(*) as remaining FROM todos;
+SELECT 'Companies:' as table_name, COUNT(*) as remaining FROM companies;
+SELECT 'Projects:' as table_name, COUNT(*) as remaining FROM projects;
+SELECT 'Notes:' as table_name, COUNT(*) as remaining FROM notes;
+SELECT 'Events:' as table_name, COUNT(*) as remaining FROM events;
+SELECT 'Messages:' as table_name, COUNT(*) as remaining FROM messages;
+SELECT 'Chat Groups:' as table_name, COUNT(*) as remaining FROM chat_groups;
+SELECT 'Time Entries:' as table_name, COUNT(*) as remaining FROM time_entries;
+SELECT 'Services:' as table_name, COUNT(*) as remaining FROM services;
+
+SELECT 'Cleanup completed!' as status;