feat: teams within a project

Projects keep teams of members in their settings (settings.teams; people
outside the project are dropped, teams are archived, not removed; absent
when saving means unchanged). Tickets go to a team (`team`, also filtered
in the list and in MCP search_issues), and a comment mentioning
@[Frontend](team-FRONT) tells each of its members. Settings has the teams
with their members, the ticket a «Equipo» select, the list a team filter,
and «@» offers the teams after the people.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/application/src/lib/event-handlers/activity-summary.ts

@@ -86,6 +86,7 @@ const FIELD: Record<string, string> = {
   description: 'la descripción',
   type: 'el tipo',
   area: 'el área',
+  team: 'el equipo',
   priority: 'la prioridad',
   labels: 'las etiquetas',
   figmaUrl: 'el enlace de Figma',