feat: team assignment on tickets + My team's tickets view

Backend:
- team_id column on tickets table
- team_id filter in GET /tickets (resolves team members)
- team_id in UpdateTicketSchema + PATCH handler
- SetTeam transaction type

Frontend:
- Team selector in ticket detail properties sidebar
- My team's tickets in sidebar (when user belongs to a team)
- team_id passed through to API from ticket list page

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/app/page.tsx

@@ -198,12 +198,14 @@ function TicketWorkbenchContent() {
         }
       }
 
+      const routeTeamId = searchParams.get("team_id") ?? "";
       const [ticketsRes, queuesRes, usersRes, fieldsRes, lifecycleRes] = await Promise.all([
         getTickets({
           q: searchQuery.trim() || undefined,
           status: apiStatus || undefined,
           queue_id: activeQueue || apiQueue || undefined,
           owner_id: apiOwner || undefined,
+          team_id: routeTeamId || undefined,
           custom_fields: Object.keys(customFieldFilters).length > 0 ? customFieldFilters : undefined,
         }),
         getQueues(),