fix: update todosCount checks and refactor key accomplishments extraction

- Changed todosCount checks in AchievementCard and ChallengeCard to ensure proper handling of undefined values.
- Updated extractKeyAccomplishments method to be asynchronous and count all related todos using Prisma, improving accuracy in task completion metrics.
- Refactored relatedItems and todosCount handling for better clarity and functionality in ManagerSummaryService.

src/components/ui/AchievementCard.tsx

@@ -76,7 +76,7 @@ export function AchievementCard({
       )}
       
       {/* Count de todos */}
-      {achievement.todosCount && achievement.todosCount > 0 && (
+      {achievement.todosCount !== undefined && achievement.todosCount > 0 && (
         <div className="flex items-center gap-1 text-xs text-[var(--muted-foreground)]">
           <span>📋</span>
           <span>{achievement.todosCount} todo{achievement.todosCount > 1 ? 's' : ''}</span>