Destroy owned sandboxes on user disable and fix OAuth login resilience

When an admin disables a user, all active sandboxes (running, paused,
hibernated) for teams they own are now destroyed and their API keys
are deleted. User queries now filter by status column instead of
deleted_at, so re-enabling a user always works. OAuth login paths
use ensureDefaultTeam to auto-create a team if the user has none,
matching the email/password login behavior.

internal/api/server.go

@@ -58,7 +58,7 @@ func New(
 	templateSvc := &service.TemplateService{DB: queries}
 	hostSvc := &service.HostService{DB: queries, Redis: rdb, JWT: jwtSecret, Pool: pool, CA: ca}
 	teamSvc := &service.TeamService{DB: queries, Pool: pgPool, HostPool: pool}
-	userSvc := &service.UserService{DB: queries}
+	userSvc := &service.UserService{DB: queries, SandboxSvc: sandboxSvc}
 	auditSvc := &service.AuditService{DB: queries}
 	statsSvc := &service.StatsService{DB: queries, Pool: pgPool}
 	buildSvc := &service.BuildService{DB: queries, Redis: rdb, Pool: pool, Scheduler: sched}