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/validators/auth.validators.js

@@ -76,7 +76,7 @@ export const createUserSchema = z.object({
   emailPassword: z.string().min(1).optional(),
   firstName: z.string().max(100).optional(),
   lastName: z.string().max(100).optional(),
-  role: z.enum(['admin', 'member']).optional(),
+  role: z.enum(['admin', 'team_leader', 'member']).optional(),
 });
 
 // Update user schema
@@ -89,7 +89,7 @@ export const updateUserSchema = z.object({
 // Change role schema (admin only)
 export const changeRoleSchema = z.object({
   userId: z.string().uuid('Neplatný formát user ID'),
-  role: z.enum(['admin', 'member'], {
+  role: z.enum(['admin', 'team_leader', 'member'], {
     required_error: 'Rola je povinná',
     invalid_type_error: 'Neplatná rola',
   }),