feat(wireguard): selektiver .conf-Import — Auswahl einzelner Interfaces per Modal

- GET /wireguard/importable listet alle .conf-Dateien in /etc/wireguard/
  mit already_in-Flag (bereits in DB)
- POST /wireguard/import nimmt optionale Names-Liste; ohne Namen → alles
- edgeguard-ctl wg-import [iface…] importiert nur die genannten Interfaces
- UI: Checkbox-Modal mit "Alle neuen auswählen" + Einzelauswahl;
  bereits importierte Interfaces disabled + grüner Tag

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

internal/handlers/wireguard.go

@@ -83,6 +83,8 @@ func (h *WireguardHandler) Register(rg *gin.RouterGroup) {
 	// row per (iface, peer) with last_handshake + transfer counters.
 	// Polled by the UI every 10s; no DB write.
 	g.GET("/status", h.Status)
+	g.GET("/importable", h.ListImportable)
+	g.POST("/import", h.Import)
 }
 
 // ── Live wg-show status ─────────────────────────────────────────────
@@ -142,6 +144,45 @@ func (h *WireguardHandler) Status(c *gin.Context) {
 	response.OK(c, gin.H{"status": rows})
 }
 
+// ── Import ────────────────────────────────────────────────────────
+
+const wgImportDir = "/etc/wireguard"
+
+// ListImportable scans /etc/wireguard for *.conf files and reports
+// which are new (not yet in the DB) vs. already imported.
+func (h *WireguardHandler) ListImportable(c *gin.Context) {
+	im := wireguard.NewImporter(h.Ifaces, h.Peers, h.Box)
+	entries, err := im.ListImportable(c.Request.Context(), wgImportDir)
+	if err != nil {
+		response.Internal(c, err)
+		return
+	}
+	response.OK(c, gin.H{"entries": entries})
+}
+
+// Import imports selected (or all) WireGuard .conf files from
+// /etc/wireguard into the DB. Body: { "names": ["wg0","wg1"] }.
+// Empty or missing names → import all.
+func (h *WireguardHandler) Import(c *gin.Context) {
+	var req struct {
+		Names []string `json:"names"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, err)
+		return
+	}
+	im := wireguard.NewImporter(h.Ifaces, h.Peers, h.Box)
+	res, err := im.ImportSelected(c.Request.Context(), wgImportDir, req.Names)
+	if err != nil {
+		response.Internal(c, err)
+		return
+	}
+	_ = h.Audit.Log(c.Request.Context(), actorOf(c), "wireguard.import",
+		fmt.Sprintf("%d ifaces", res.IfacesAdded), res, h.NodeID)
+	h.reload(c.Request.Context(), "import")
+	response.OK(c, res)
+}
+
 // ── Keygen ────────────────────────────────────────────────────────
 
 func (h *WireguardHandler) GenerateKeypair(c *gin.Context) {