feat: WireGuard (server + client + peers + QR) + shared UI components

WireGuard
---------
* Migration 0013: wireguard_interfaces (server|client mode, key envelope-
  encrypted) + wireguard_peers (per-server roster). Drop old empty
  0005-Schema (Option-A peer_type, kein Iface-FK), neuer Aufbau mit
  zwei Tabellen + FK.
* internal/services/secrets: Box mit AES-256-GCM, Master-Key in
  /var/lib/edgeguard/.master_key (lazy-create, 0600). Sealed/Open
  für PrivateKey + PSK.
* internal/services/wireguard: KeyGen (Curve25519 mit clamping),
  PublicFromPrivate (für Import), InterfacesRepo, PeersRepo, Importer
  (parst /etc/wireguard/*.conf, server vs. client heuristisch nach
  ListenPort + Peer-Anzahl).
* internal/wireguard: Renderer schreibt /etc/edgeguard/wireguard/<iface>.conf
  (0600), restartet wg-quick@<iface> via sudo (sudoers im postinst
  erweitert). Idempotent — re-render nur wenn content geändert.
* internal/handlers/wireguard.go: REST CRUD für interfaces+peers,
  /generate-keypair, /peers/:id/config (text/plain wg-quick conf),
  /peers/:id/qr (PNG via go-qrcode). Auto-reload nach Mutation.
* edgeguard-ctl wg-import [--path /etc/wireguard]: liest existierende
  conf-Files in die DB. Idempotent (überspringt vorhandene Iface-Namen).

Shared UI components (proxy-lb-waf design pattern)
--------------------------------------------------
* PageHeader: icon + title + subtitle + extras row, einheitlich oben
  auf jeder Page.
* ActionButtons: Edit + Delete combo mit Popconfirm + Tooltip.
* StatusDot: AntD Badge pattern statt "Yes/No" — schneller scanbar
  in dichten Tabellen.
* DataTable: pageSizeOptions [20,50,100,200] + extraActions-Alias +
  optional renderMobileCard für Card-Liste auf < md Breakpoint.
* enterprise.css: .page-header* + .datatable-toolbar Klassen.

Frontend WireGuard
------------------
* /vpn/wireguard mit zwei Tabs (Server / Client) im neuen Pattern.
* Server-Tab: Modal mit Generate-Keypair-Toggle, Peer-Roster im
  Drawer per Server. Pro Peer: QR-Code-Modal + .conf-Download.
* Client-Tab: Upstream-Card im Modal, full-tunnel-Default
  (0.0.0.0/0,::/0), Keepalive 25.
* i18n DE/EN für wg.* Block + common.* Erweiterung.

Misc
----
* Sidebar: WireGuard unter Security-Sektion.
* Nav-i18n: "Firewall (v2)" → "Firewall".
* Version 1.0.8 → 1.0.11.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/services/wireguard/peers.go

@@ -0,0 +1,132 @@
+package wireguard
+
+import (
+	"context"
+	"errors"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"git.netcell-it.de/projekte/edgeguard-native/internal/models"
+)
+
+var ErrPeerNotFound = errors.New("wireguard peer not found")
+
+type PeersRepo struct {
+	Pool *pgxpool.Pool
+}
+
+func NewPeersRepo(pool *pgxpool.Pool) *PeersRepo { return &PeersRepo{Pool: pool} }
+
+const peerBaseSelect = `
+SELECT id, interface_id, name, public_key, private_key_enc, psk_enc,
+       allowed_ips, keepalive, last_handshake, transfer_rx, transfer_tx,
+       enabled, description, created_at, updated_at
+FROM wireguard_peers
+`
+
+func (r *PeersRepo) ListForInterface(ctx context.Context, ifaceID int64) ([]models.WireguardPeer, error) {
+	rows, err := r.Pool.Query(ctx, peerBaseSelect+" WHERE interface_id = $1 ORDER BY name ASC", ifaceID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := make([]models.WireguardPeer, 0, 8)
+	for rows.Next() {
+		p, err := scanPeer(rows)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, *p)
+	}
+	return out, rows.Err()
+}
+
+func (r *PeersRepo) ListAll(ctx context.Context) ([]models.WireguardPeer, error) {
+	rows, err := r.Pool.Query(ctx, peerBaseSelect+" ORDER BY interface_id, name ASC")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := make([]models.WireguardPeer, 0, 16)
+	for rows.Next() {
+		p, err := scanPeer(rows)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, *p)
+	}
+	return out, rows.Err()
+}
+
+func (r *PeersRepo) Get(ctx context.Context, id int64) (*models.WireguardPeer, error) {
+	row := r.Pool.QueryRow(ctx, peerBaseSelect+" WHERE id = $1", id)
+	p, err := scanPeer(row)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil, ErrPeerNotFound
+		}
+		return nil, err
+	}
+	return p, nil
+}
+
+func (r *PeersRepo) Create(ctx context.Context, p models.WireguardPeer) (*models.WireguardPeer, error) {
+	row := r.Pool.QueryRow(ctx, `
+INSERT INTO wireguard_peers (
+  interface_id, name, public_key, private_key_enc, psk_enc, allowed_ips,
+  keepalive, enabled, description
+) VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9)
+RETURNING id, interface_id, name, public_key, private_key_enc, psk_enc,
+          allowed_ips, keepalive, last_handshake, transfer_rx, transfer_tx,
+          enabled, description, created_at, updated_at`,
+		p.InterfaceID, p.Name, p.PublicKey, p.PrivateKeyEnc, p.PSKEnc, p.AllowedIPs,
+		p.Keepalive, p.Enabled, p.Description)
+	return scanPeer(row)
+}
+
+func (r *PeersRepo) Update(ctx context.Context, id int64, p models.WireguardPeer) (*models.WireguardPeer, error) {
+	row := r.Pool.QueryRow(ctx, `
+UPDATE wireguard_peers SET
+   name = $1, public_key = $2, private_key_enc = $3, psk_enc = $4,
+   allowed_ips = $5, keepalive = $6, enabled = $7, description = $8,
+   updated_at = NOW()
+WHERE id = $9
+RETURNING id, interface_id, name, public_key, private_key_enc, psk_enc,
+          allowed_ips, keepalive, last_handshake, transfer_rx, transfer_tx,
+          enabled, description, created_at, updated_at`,
+		p.Name, p.PublicKey, p.PrivateKeyEnc, p.PSKEnc,
+		p.AllowedIPs, p.Keepalive, p.Enabled, p.Description, id)
+	out, err := scanPeer(row)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil, ErrPeerNotFound
+		}
+		return nil, err
+	}
+	return out, nil
+}
+
+func (r *PeersRepo) Delete(ctx context.Context, id int64) error {
+	tag, err := r.Pool.Exec(ctx, `DELETE FROM wireguard_peers WHERE id = $1`, id)
+	if err != nil {
+		return err
+	}
+	if tag.RowsAffected() == 0 {
+		return ErrPeerNotFound
+	}
+	return nil
+}
+
+func scanPeer(row interface{ Scan(...any) error }) (*models.WireguardPeer, error) {
+	var p models.WireguardPeer
+	if err := row.Scan(
+		&p.ID, &p.InterfaceID, &p.Name, &p.PublicKey, &p.PrivateKeyEnc, &p.PSKEnc,
+		&p.AllowedIPs, &p.Keepalive, &p.LastHandshake, &p.TransferRX, &p.TransferTX,
+		&p.Enabled, &p.Description, &p.CreatedAt, &p.UpdatedAt,
+	); err != nil {
+		return nil, err
+	}
+	p.HasPrivateKey = len(p.PrivateKeyEnc) > 0
+	return &p, nil
+}