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/types/content.ts

@@ -29,6 +29,7 @@ export interface TeamMember {
   role: string;
   image: string;
   instagram?: string;
+  shortDescription?: string;
   description?: string;
   experience?: string[];
   victories?: VictoryItem[];