feat(config-preview): chrony + wireguard in Config-Preview verfügbar

- chrony.RenderToString(): rendert /etc/chrony/conf.d/edgeguard.conf
  ohne Datei-Write oder Service-Reload
- wireguard.RenderToString(): kombiniert alle aktiven Interface-Configs;
  PrivateKey + PresharedKey werden als <redacted> ausgegeben (sicher für
  UI-Anzeige)
- main.go: beide in WithConfigPreviewers eingetragen
- Settings UI: chrony + wireguard im Generator-Dropdown

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cmd/edgeguard-api/main.go

@@ -60,7 +60,7 @@ import (
 	usersvc "git.netcell-it.de/projekte/edgeguard-native/internal/services/users"
 )
 
-var version = "1.1.96"
+var version = "1.1.97"
 
 func main() {
 	addr := os.Getenv("EDGEGUARD_API_ADDR")
@@ -268,10 +268,12 @@ func main() {
 		systemHdl.WithAudit(auditRepo, nodeID)
 		systemHdl.WithDB(pool)
 		systemHdl.WithConfigPreviewers(map[string]func(context.Context) (string, error){
-				"haproxy":  haproxy.New(pool).RenderToString,
-				"nftables": firewallrender.New(pool).RenderToString,
-				"squid":    squidrender.New(pool).RenderToString,
-				"unbound":  unboundrender.New(pool).RenderToString,
+				"haproxy":   haproxy.New(pool).RenderToString,
+				"nftables":  firewallrender.New(pool).RenderToString,
+				"squid":     squidrender.New(pool).RenderToString,
+				"unbound":   unboundrender.New(pool).RenderToString,
+				"chrony":    chronyrender.New(pool).RenderToString,
+				"wireguard": wgrender.New(pool, secretsBox).RenderToString,
 			})
 		setupHdl.WithAudit(auditRepo, nodeID)
 		usersRepo := usersvc.New(pool)

cmd/edgeguard-ctl/main.go

@@ -11,7 +11,7 @@ import (
 	"git.netcell-it.de/projekte/edgeguard-native/internal/services/setup"
 )
 
-var version = "1.1.96"
+var version = "1.1.97"
 
 const usage = `edgeguard-ctl — EdgeGuard CLI
 

cmd/edgeguard-scheduler/main.go

@@ -35,7 +35,7 @@ import (
 	"git.netcell-it.de/projekte/edgeguard-native/internal/services/tlscerts"
 )
 
-var version = "1.1.96"
+var version = "1.1.97"
 
 const (
 	// renewTickInterval — how often we re-evaluate expiring certs.