feat: add short description for team carousel cards

- Add shortDescription field to TeamMember type
- DB migration #11: add short_description column to team_members
- Admin editor: separate "Краткое описание (для карточки)" and "Полное описание"
- Carousel shows shortDescription with line-clamp-3, falls back to description
- Full description shown in "Подробнее" profile view

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/sections/team/TeamMemberInfo.tsx

@@ -31,9 +31,9 @@ export function TeamMemberInfo({ members, activeIndex, onSelect, onOpenBio }: Te
         </a>
       )}
 
-      {member.description && (
+      {(member.shortDescription || member.description) && (
         <p className="mt-3 text-sm leading-relaxed text-white/55 line-clamp-3">
-          {member.description}
+          {member.shortDescription || member.description}
         </p>
       )}