Replace from-scratch rewrite with real ngoduykhanh/wireguard-ui fork

The from-scratch Go rewrite had unresolved bugs (missing go.sum, UI
404s, path issues) from being built without a working local Go
toolchain to verify against. Switching strategy: use the actual
upstream wireguard-ui codebase (proven, battle-tested single-server
manager) as the base, and extend it for multi-server support instead
of re-deriving everything from zero.

Kept our own installers (bootstrap.sh, update.sh, scripts/install.sh,
scripts/proxmox-install.sh) - these still apply, just need updating
to build/install the upstream module layout instead of the old
cmd/wireguard-ui-multi structure.

Module path intentionally left as upstream's own
(github.com/ngoduykhanh/wireguard-ui) for now to avoid touching every
internal import; revisit if this needs to be fully rebranded.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

model/wake_on_lan_host.go

@@ -0,0 +1,31 @@
+package model
+
+import (
+	"errors"
+	"net"
+	"strings"
+	"time"
+)
+
+type WakeOnLanHost struct {
+	MacAddress string     `json:"MacAddress"`
+	Name       string     `json:"Name"`
+	LatestUsed *time.Time `json:"LatestUsed"`
+}
+
+func (host WakeOnLanHost) ResolveResourceName() (string, error) {
+	resourceName := strings.Trim(host.MacAddress, " \t\r\n\000")
+	if len(resourceName) == 0 {
+		return "", errors.New("mac Address is Empty")
+	}
+	resourceName = strings.ToUpper(resourceName)
+	resourceName = strings.ReplaceAll(resourceName, ":", "-")
+
+	if _, err := net.ParseMAC(resourceName); err != nil {
+		return "", errors.New("invalid mac address")
+	}
+
+	return resourceName, nil
+}
+
+const WakeOnLanHostCollectionName = "wake_on_lan_hosts"