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/web/tracker/infrastructure/src/lib/adapters/mappers.ts

@@ -113,5 +113,11 @@ export function toSettingsInput(
       archived: f.archived,
     })),
     checklistBeforeDone: !!settings.checklistBeforeDone,
+    teams: (settings.teams ?? []).map((t) => ({
+      id: t.id,
+      name: t.name,
+      memberIds: t.memberIds,
+      archived: t.archived,
+    })),
   };
 }