Shares of other services and RepoISO integration

- include SMB drop-ins from /etc/samba/smb.conf.d into the generated smb.conf
- keep smbd/nfs-server running while other services (/etc/exports.d, drop-ins) share,
  instead of disabling them when nasmon has no shares of its own
- list those shares read-only on /shares
- settings: RepoISO URL; poll its /api/integration/status, dashboard card, menu link,
  alerts for portal down, stale worker, failed jobs, unmounted publications

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

internal/sched/sched.go

@@ -54,6 +54,7 @@ type Status struct {
 	NextSmartCheck time.Time             `json:"next_smart_check"`
 	SmartRunning   bool                  `json:"smart_running"`
 	LastMailErr    string                `json:"last_mail_err,omitempty"`
+	RepoISO        *collect.RepoISO      `json:"repoiso,omitempty"`
 }
 
 type Scheduler struct {
@@ -243,6 +244,11 @@ func (s *Scheduler) collectStorage() {
 	root, _ := collect.ReadFS("/")
 	alerts, _ := s.st.ActiveAlerts()
 	services := collect.ReadShareServices()
+	var repoiso *collect.RepoISO
+	if url := s.cfg.Get().Integrations.RepoISOURL; url != "" {
+		r := collect.FetchRepoISO(url)
+		repoiso = &r
+	}
 
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -264,6 +270,7 @@ func (s *Scheduler) collectStorage() {
 	s.status.RootFS = root
 	s.status.Alerts = alerts
 	s.status.Services = services
+	s.status.RepoISO = repoiso
 }
 
 // buildViews merges lsblk disks with cached SMART data; caller holds s.mu.
@@ -419,7 +426,8 @@ func (s *Scheduler) evaluate() {
 		Disks: nil, Pools: st.Pools, PoolsOK: st.PoolsErr == "",
 		CPUTemp: st.CPUTemp, HasCPU: st.HasCPUTemp,
 		RootFS: st.RootFS, RootOK: st.RootFS.Total > 0,
-		Prev: map[string]*collect.Smart{},
+		Prev:    map[string]*collect.Smart{},
+		RepoISO: st.RepoISO,
 	}
 	for _, v := range st.Disks {
 		in.Disks = append(in.Disks, v.Disk)