feat: Multi-feature CRM update

- Add team_leader role with appropriate permissions
- Add lastSeen timestamp for chat online indicator
- Add needsFollowup flag to ucastnici table
- Add getTodayCalendarCount endpoint for calendar badge
- Add company reminders to calendar data
- Enhance company search to include phone and contacts
- Update routes to allow team_leader access to kurzy, services, timesheets

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

src/middlewares/auth/roleMiddleware.js

@@ -38,3 +38,7 @@ export const requireRole = (...allowedRoles) => {
  */
 export const requireAdmin = requireRole('admin');
 
+/**
+ * Middleware pre admin alebo team_leader rolu
+ */
+export const requireTeamLeaderOrAdmin = requireRole('admin', 'team_leader');