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/client.go

@@ -0,0 +1,38 @@
+package model
+
+import (
+	"time"
+)
+
+// Client model
+type Client struct {
+	ID              string    `json:"id"`
+	PrivateKey      string    `json:"private_key"`
+	PublicKey       string    `json:"public_key"`
+	PresharedKey    string    `json:"preshared_key"`
+	Name            string    `json:"name"`
+	TgUserid        string    `json:"telegram_userid"`
+	Email           string    `json:"email"`
+	SubnetRanges    []string  `json:"subnet_ranges,omitempty"`
+	AllocatedIPs    []string  `json:"allocated_ips"`
+	AllowedIPs      []string  `json:"allowed_ips"`
+	ExtraAllowedIPs []string  `json:"extra_allowed_ips"`
+	Endpoint        string    `json:"endpoint"`
+	AdditionalNotes string    `json:"additional_notes"`
+	UseServerDNS    bool      `json:"use_server_dns"`
+	Enabled         bool      `json:"enabled"`
+	CreatedAt       time.Time `json:"created_at"`
+	UpdatedAt       time.Time `json:"updated_at"`
+}
+
+// ClientData includes the Client and extra data
+type ClientData struct {
+	Client *Client
+	QRCode string
+}
+
+type QRCodeSettings struct {
+	Enabled    bool
+	IncludeDNS bool
+	IncludeMTU bool
+}

model/client_defaults.go

@@ -0,0 +1,9 @@
+package model
+
+// ClientDefaults Defaults for creation of new clients used in the templates
+type ClientDefaults struct {
+	AllowedIps          []string
+	ExtraAllowedIps     []string
+	UseServerDNS        bool
+	EnableAfterCreation bool
+}

model/misc.go

@@ -0,0 +1,20 @@
+package model
+
+// Interface model
+type Interface struct {
+	Name      string `json:"name"`
+	IPAddress string `json:"ip_address"`
+}
+
+// BaseData struct to pass value to the base template
+type BaseData struct {
+	Active      string
+	CurrentUser string
+	Admin       bool
+}
+
+// ClientServerHashes struct, to save hashes to detect changes
+type ClientServerHashes struct {
+	Client string `json:"client"`
+	Server string `json:"server"`
+}

model/server.go

@@ -0,0 +1,28 @@
+package model
+
+import (
+	"time"
+)
+
+// Server model
+type Server struct {
+	KeyPair   *ServerKeypair
+	Interface *ServerInterface
+}
+
+// ServerKeypair model
+type ServerKeypair struct {
+	PrivateKey string    `json:"private_key"`
+	PublicKey  string    `json:"public_key"`
+	UpdatedAt  time.Time `json:"updated_at"`
+}
+
+// ServerInterface model
+type ServerInterface struct {
+	Addresses  []string  `json:"addresses"`
+	ListenPort int       `json:"listen_port,string"` // ,string to get listen_port string input as int
+	UpdatedAt  time.Time `json:"updated_at"`
+	PostUp     string    `json:"post_up"`
+	PreDown    string    `json:"pre_down"`
+	PostDown   string    `json:"post_down"`
+}

model/setting.go

@@ -0,0 +1,17 @@
+package model
+
+import (
+	"time"
+)
+
+// GlobalSetting model
+type GlobalSetting struct {
+	EndpointAddress     string    `json:"endpoint_address"`
+	DNSServers          []string  `json:"dns_servers"`
+	MTU                 int       `json:"mtu,string"`
+	PersistentKeepalive int       `json:"persistent_keepalive,string"`
+	FirewallMark        string    `json:"firewall_mark"`
+	Table               string    `json:"table"`
+	ConfigFilePath      string    `json:"config_file_path"`
+	UpdatedAt           time.Time `json:"updated_at"`
+}

model/user.go

@@ -0,0 +1,10 @@
+package model
+
+// User model
+type User struct {
+	Username string `json:"username"`
+	Password string `json:"password"`
+	// PasswordHash takes precedence over Password.
+	PasswordHash string `json:"password_hash"`
+	Admin        bool   `json:"admin"`
+}

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"