feat(snmp,ui): устройства за портом (MAC/IP) в таблице 2

Добавил сбор FDB/ARP по SNMP (BRIDGE-MIB + ipNetToMedia), хранение и API /port-devices.
В UI Таблица 2 теперь показывает MAC/IP за выбранным портом после клика по строке Таблицы 1.

Made-with: Cursor

internal/scans/store.go

@@ -69,6 +69,8 @@ type Store interface {
 	ListLLDPResults(scanID string, limit int) []LLDPResult
 	SaveInterfaceResult(scanID string, result InterfaceResult) error
 	ListInterfaceResults(scanID string, filterIP string, limit int) []InterfaceResult
+	SavePortDeviceResult(scanID string, result PortDeviceResult) error
+	ListPortDeviceResults(scanID string, filterIP string, filterIfIndex int, limit int) []PortDeviceResult
 	// PurgeAllScanData удаляет все сканы и связанные строки (хосты, порты, SNMP, LLDP, интерфейсы).
 	PurgeAllScanData() error
 }
@@ -115,6 +117,15 @@ type InterfaceResult struct {
 	CheckedAt    time.Time `json:"checked_at"`
 }
 
+// PortDeviceResult — MAC/IP, обнаруженные за конкретным портом (ifIndex) через BRIDGE-MIB + ARP.
+type PortDeviceResult struct {
+	IP        string    `json:"ip"`
+	IfIndex   int       `json:"if_index"`
+	MAC       string    `json:"mac"`
+	LearnedIP string    `json:"learned_ip"`
+	CheckedAt time.Time `json:"checked_at"`
+}
+
 type MemoryStore struct {
 	mu     sync.RWMutex
 	jobs   map[string]ScanJob
@@ -123,6 +134,7 @@ type MemoryStore struct {
 	snmp   map[string][]SNMPResult
 	lldp   map[string][]LLDPResult
 	ifaces map[string][]InterfaceResult
+	fdb    map[string][]PortDeviceResult
 }
 
 func NewMemoryStore() *MemoryStore {
@@ -133,6 +145,7 @@ func NewMemoryStore() *MemoryStore {
 		snmp:   make(map[string][]SNMPResult),
 		lldp:   make(map[string][]LLDPResult),
 		ifaces: make(map[string][]InterfaceResult),
+		fdb:    make(map[string][]PortDeviceResult),
 	}
 }
 
@@ -341,6 +354,7 @@ func (s *MemoryStore) PurgeAllScanData() error {
 	s.snmp = make(map[string][]SNMPResult)
 	s.lldp = make(map[string][]LLDPResult)
 	s.ifaces = make(map[string][]InterfaceResult)
+	s.fdb = make(map[string][]PortDeviceResult)
 	return nil
 }
 
@@ -373,6 +387,52 @@ func (s *MemoryStore) ListInterfaceResults(scanID string, filterIP string, limit
 	return out
 }
 
+func (s *MemoryStore) SavePortDeviceResult(scanID string, result PortDeviceResult) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if _, ok := s.jobs[scanID]; !ok {
+		return errors.New("scan not found")
+	}
+	s.fdb[scanID] = append(s.fdb[scanID], result)
+	return nil
+}
+
+func (s *MemoryStore) ListPortDeviceResults(scanID string, filterIP string, filterIfIndex int, limit int) []PortDeviceResult {
+	if limit <= 0 {
+		limit = 20000
+	}
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	items := s.fdb[scanID]
+	filtered := make([]PortDeviceResult, 0, len(items))
+	for _, r := range items {
+		if filterIP != "" && r.IP != filterIP {
+			continue
+		}
+		if filterIfIndex > 0 && r.IfIndex != filterIfIndex {
+			continue
+		}
+		filtered = append(filtered, r)
+	}
+	sort.Slice(filtered, func(i, j int) bool {
+		if filtered[i].IfIndex != filtered[j].IfIndex {
+			return filtered[i].IfIndex < filtered[j].IfIndex
+		}
+		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