Remove the RepoISO integration; keep generic support for shares of other services

RepoISO now manages the NAS itself, so nasmon no longer polls it (settings field, dashboard card,
menu link and repoiso:* alerts are gone). Drop-in SMB includes, read-only listing and keeping
smbd/nfs-server running for other software's shares stay.

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

internal/alert/rules.go

@@ -40,8 +40,6 @@ type Input struct {
 	HasCPU  bool
 	RootFS  collect.FSUsage
 	RootOK  bool
-	// RepoISO is the polled RepoISO health (nil when the integration is off).
-	RepoISO *collect.RepoISO
 	// Frozen lists key prefixes whose open alerts must be left untouched
 	// because no fresh data was available for them in this cycle.
 	Frozen []string
@@ -196,36 +194,10 @@ func Evaluate(in Input) []Event {
 		}
 	}
 
-	if r := in.RepoISO; r != nil {
-		switch {
-		case !r.Reachable:
-			add("repoiso:api:down", LevelCrit, "RepoISO is not responding",
-				fmt.Sprintf("%s/api/integration/status: %s. Check: systemctl status repoiso-api nginx", r.URL, r.Error))
-		case !r.WorkerAlive:
-			add("repoiso:worker:stale", LevelWarn, "RepoISO worker is not running",
-				fmt.Sprintf("Last worker heartbeat: %s. Downloads, mounts and Proxmox exports are not processed. Check: systemctl status repoiso-worker", orNever(r.WorkerHeartbeat)))
-		}
-		if r.Reachable && r.JobsFailed24h > 0 {
-			add("repoiso:jobs:failed", LevelWarn, fmt.Sprintf("RepoISO: %d failed job(s) in 24 h", r.JobsFailed24h),
-				"See the Jobs page of RepoISO for the errors.")
-		}
-		if r.Reachable && r.PublicationsError > 0 {
-			add("repoiso:publications:error", LevelWarn, fmt.Sprintf("RepoISO: %d publication(s) not mounted", r.PublicationsError),
-				"See the Publications page of RepoISO; remount or unpublish the image.")
-		}
-	}
-
 	sort.Slice(ev, func(i, j int) bool { return ev[i].Key < ev[j].Key })
 	return ev
 }
 
-func orNever(s string) string {
-	if s == "" {
-		return "never"
-	}
-	return s
-}
-
 func humanBytes(b uint64) string {
 	const unit = 1024
 	if b < unit {