fix: Kuma import tokens/paused, Docker hardening, migrate-secrets idempotency

1. Kuma import now maps push monitor tokens (generates crypto/rand
   token) and paused state (Active=false → Paused=true). Previously
   push monitors imported with empty token sat DOWN forever, and
   paused Kuma monitors came in unpaused and started alerting.

2. Dockerfile adds HEALTHCHECK against /api/health on port 8080.
   Container orchestrators can now detect unhealthy instances.

3. migrate-secrets sets the encryptor before loading alerts, so
   already-encrypted settings are decrypted correctly on second run
   instead of failing with a JSON unmarshal error.

4. docker-compose.yml adds container hardening: read_only filesystem,
   cap_drop ALL, no-new-privileges, tmpfs for /tmp.

Dockerfile

@@ -31,6 +31,8 @@ ENV UPTOP_SSH_HOST_KEY=/data/.ssh/id_ed25519
 ENV UPTOP_PORT=23234
 
 EXPOSE 23234
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD wget -qO- http://localhost:8080/api/health || exit 1
 USER uptop
 ENTRYPOINT ["docker-entrypoint.sh"]
 CMD ["./uptop"]

cmd/uptop/main.go

@@ -237,13 +237,13 @@ func runMigrateSecrets(args []string) {
 		os.Exit(1)
 	}
 
+	ss.SetEncryptor(enc)
+
 	alerts, err := ss.GetAllAlerts(context.Background())
 	if err != nil {
 		slog.Error("failed to load alerts", "err", err)
 		os.Exit(1)
 	}
-
-	ss.SetEncryptor(enc)
 	migrated := 0
 	for _, a := range alerts {
 		if err := ss.UpdateAlert(context.Background(), a.ID, a.Name, a.Type, a.Settings); err != nil {

deploy/docker-compose.yml

@@ -5,6 +5,13 @@ services:
       dockerfile: Dockerfile
     container_name: uptop
     restart: unless-stopped
+    read_only: true
+    cap_drop:
+      - ALL
+    security_opt:
+      - no-new-privileges:true
+    tmpfs:
+      - /tmp
     ports:
       - "23234:23234"
       - "8080:8080"

internal/importer/kuma.go

@@ -1,6 +1,8 @@
 package importer
 
 import (
+	"crypto/rand"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"os"
@@ -156,10 +158,18 @@ func convertKumaMonitor(m KumaMonitor, alertMap map[int]int) models.SiteConfig {
 	site.DNSResolveType = m.DNSResolveType
 	site.DNSServer = m.DNSResolveServer
 
+	site.Paused = !m.Active
+
 	switch m.Type {
 	case "http":
 		site.URL = m.URL
 		site.CheckSSL = m.ExpiryNotif
+	case "push":
+		site.Type = "push"
+		b := make([]byte, 16)
+		if _, err := rand.Read(b); err == nil {
+			site.Token = hex.EncodeToString(b)
+		}
 	case "ping":
 		if m.Hostname != "" {
 			site.Hostname = m.Hostname