fix(snmp,db): save FDB to PG (empty inet null), bridge_port + MAC normalize

Made-with: Cursor

internal/scans/store.go

@@ -119,11 +119,12 @@ type InterfaceResult struct {
 
 // 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"`
+	IP         string    `json:"ip"`
+	IfIndex    int       `json:"if_index"`
+	BridgePort int       `json:"bridge_port,omitempty"`
+	MAC        string    `json:"mac"`
+	LearnedIP  string    `json:"learned_ip"`
+	CheckedAt  time.Time `json:"checked_at"`
 }
 
 type MemoryStore struct {
@@ -409,7 +410,7 @@ func (s *MemoryStore) ListPortDeviceResults(scanID string, filterIP string, filt
 		if filterIP != "" && r.IP != filterIP {
 			continue
 		}
-		if filterIfIndex > 0 && r.IfIndex != filterIfIndex {
+		if filterIfIndex > 0 && r.IfIndex != filterIfIndex && r.BridgePort != filterIfIndex {
 			continue
 		}
 		filtered = append(filtered, r)