feat: MAC lookup in scan FDB (API mac-locations, UI table, index)

Made-with: Cursor

internal/scans/store.go

@@ -71,6 +71,8 @@ type Store interface {
 	ListInterfaceResults(scanID string, filterIP string, limit int) []InterfaceResult
 	SavePortDeviceResult(scanID string, result PortDeviceResult) error
 	ListPortDeviceResults(scanID string, filterIP string, filterIfIndex int, limit int) []PortDeviceResult
+	// ListPortDevicesByMac — строки FDB по точному MAC (mac уже в каноническом виде, см. NormalizeMAC).
+	ListPortDevicesByMac(scanID string, mac string, limit int) []PortDeviceResult
 	// PurgeAllScanData удаляет все сканы и связанные строки (хосты, порты, SNMP, LLDP, интерфейсы).
 	PurgeAllScanData() error
 }
@@ -439,6 +441,47 @@ func (s *MemoryStore) ListPortDeviceResults(scanID string, filterIP string, filt
 	return out
 }
 
+func (s *MemoryStore) ListPortDevicesByMac(scanID string, mac string, limit int) []PortDeviceResult {
+	if limit <= 0 {
+		limit = 5000
+	}
+	if mac == "" {
+		return nil
+	}
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	items := s.fdb[scanID]
+	filtered := make([]PortDeviceResult, 0, 8)
+	for _, r := range items {
+		if NormalizeMAC(r.MAC) == mac {
+			filtered = append(filtered, r)
+		}
+	}
+	sort.Slice(filtered, func(i, j int) bool {
+		if filtered[i].IP != filtered[j].IP {
+			return filtered[i].IP < filtered[j].IP
+		}
+		if filtered[i].IfIndex != filtered[j].IfIndex {
+			return filtered[i].IfIndex < filtered[j].IfIndex
+		}
+		if filtered[i].Vlan != filtered[j].Vlan {
+			return filtered[i].Vlan < filtered[j].Vlan
+		}
+		if filtered[i].MAC != filtered[j].MAC {
+			return filtered[i].MAC < filtered[j].MAC
+		}
+		return filtered[i].LearnedIP < filtered[j].LearnedIP
+	})
+	if len(filtered) <= limit {
+		out := make([]PortDeviceResult, len(filtered))
+		copy(out, filtered)
+		return out
+	}
+	out := make([]PortDeviceResult, limit)
+	copy(out, filtered[:limit])
+	return out
+}
+
 func applyDefaultOptions(opts *ScanOptions) {
 	if opts.PingTimeoutMS <= 0 {
 		opts.PingTimeoutMS = 700