feat: enhance H3C LLDP parser to support verbose format with System name and Management address

- Add support for LLDP verbose output format (display lldp neighbor-information verbose)
- Parse System name field for accurate device hostname matching
- Parse Management address field for IP-based neighbor identification
- Handle edge cases: endpoint devices without System name (fallback to MAC)
- Handle Port ID as MAC address (not interface name) for endpoint devices
- Add detailed debug logging for LLDP neighbor parsing
- Implement three-level fallback strategy: System name > Management IP > MAC address

This fixes the topology auto-linking issue where only 1 link was created despite having neighbor data.

internal/device/h3c.go

@@ -20,7 +20,7 @@ func (p *H3CParser) GetCommands() []string {
 		"display version",
 		"display interface",
 		"display interface brief",  // 接口简要信息（包含VLAN和物理接口状态）
-		"display lldp neighbor-information",
+		"display lldp neighbor-information verbose",  // LLDP邻居详细信息（包含System name和Management address）
 	}
 }
 
@@ -288,6 +288,23 @@ func (p *H3CParser) parseNeighbors(output string, arpTable map[string]string) []
 
 		if currentNeighbor != nil {
 			// 提取 ChassisID (MAC地址)
+			// Verbose格式: Chassis ID: 642f-c7e0-0333
+			if strings.Contains(line, "Chassis ID:") && !strings.Contains(line, "ChassisID/subtype") {
+				parts := strings.SplitN(line, ":", 2)
+				if len(parts) == 2 {
+					mac := strings.TrimSpace(strings.ToLower(parts[1]))
+					if isValidMAC(mac) {
+						currentNeighbor.RemoteMAC = mac
+						// 如果还没有RemoteDevice，先使用MAC作为占位符（后续可能被System name覆盖）
+						if currentNeighbor.RemoteDevice == "" {
+							currentNeighbor.RemoteDevice = mac
+						}
+						fmt.Printf("  [LLDP] Parsed neighbor MAC (verbose): %s\n", mac)
+					}
+				}
+			}
+			
+			// 非verbose格式: ChassisID/subtype: a4bb-6de2-62cd/MAC address
 			if strings.Contains(line, "ChassisID/subtype") {
 				parts := strings.SplitN(line, ":", 2)
 				if len(parts) == 2 {
@@ -295,27 +312,61 @@ func (p *H3CParser) parseNeighbors(output string, arpTable map[string]string) []
 					// 格式: a4bb-6de2-62cd/MAC address
 					if macParts := strings.Split(value, "/"); len(macParts) > 0 {
 						mac := strings.TrimSpace(strings.ToLower(macParts[0]))
-						// 保存MAC地址
 						currentNeighbor.RemoteMAC = mac
-						fmt.Printf("  Parsed neighbor MAC: %s (from line: %s)\n", mac, line)
-						
-						// 通过ARP表查找IP（如果有）
-						if ip, ok := arpTable[mac]; ok {
-							currentNeighbor.RemoteIP = ip
-							currentNeighbor.RemoteDevice = ip
-						} else {
-							// 如果ARP表中没有，使用MAC地址作为标识（但RemoteIP仍为空）
+						if currentNeighbor.RemoteDevice == "" {
 							currentNeighbor.RemoteDevice = mac
 						}
-					} else {
-						fmt.Printf("  WARNING: Could not parse MAC from ChassisID line: %s\n", line)
+						fmt.Printf("  [LLDP] Parsed neighbor MAC: %s\n", mac)
+					}
+				}
+			}
+
+			// 提取 System name (verbose格式)
+			if strings.Contains(line, "System name:") {
+				parts := strings.SplitN(line, ":", 2)
+				if len(parts) == 2 {
+					systemName := strings.TrimSpace(parts[1])
+					if systemName != "" {
+						// System name 是最可靠的匹配方式，覆盖之前的MAC地址占位符
+						currentNeighbor.RemoteDevice = systemName
+						fmt.Printf("  [LLDP] Parsed neighbor System name: %s\n", systemName)
+					}
+				}
+			}
+
+			// 提取 Management address (verbose格式)
+			if strings.Contains(line, "Management address:") {
+				parts := strings.SplitN(line, ":", 2)
+				if len(parts) == 2 {
+					mgmtAddr := strings.TrimSpace(parts[1])
+					if isValidIP(mgmtAddr) {
+						// 如果还没有RemoteIP，使用Management address
+						if currentNeighbor.RemoteIP == "" {
+							currentNeighbor.RemoteIP = mgmtAddr
+							fmt.Printf("  [LLDP] Parsed neighbor Management address: %s\n", mgmtAddr)
+						}
 					}
-				} else {
-					fmt.Printf("  WARNING: ChassisID line has no colon: %s\n", line)
 				}
 			}
 
 			// 提取 PortID (远程接口)
+			// Verbose格式: Port ID: GigabitEthernet1/0/48 或 Port ID: a4bb-6de2-62cd (MAC地址)
+			if strings.Contains(line, "Port ID:") && !strings.Contains(line, "PortID/subtype") && !strings.Contains(line, "Port ID type") {
+				parts := strings.SplitN(line, ":", 2)
+				if len(parts) == 2 {
+					portID := strings.TrimSpace(parts[1])
+					// 检查Port ID是否是MAC地址（格式: a4bb-6de2-62cd）
+					if isValidMAC(portID) {
+						// Port ID是MAC地址，不赋值给RemoteInterface
+						fmt.Printf("  [LLDP] Port ID is MAC address (not interface): %s\n", portID)
+					} else {
+						// Port ID是接口名
+						currentNeighbor.RemoteInterface = portID
+					}
+				}
+			}
+			
+			// 非verbose格式: PortID/subtype: GigabitEthernet0/0/1/Interface name
 			if strings.Contains(line, "PortID/subtype") {
 				parts := strings.SplitN(line, ":", 2)
 				if len(parts) == 2 {
@@ -330,8 +381,14 @@ func (p *H3CParser) parseNeighbors(output string, arpTable map[string]string) []
 		}
 	}
 
-	// 添加最后一个邻居
-	if currentNeighbor != nil && currentNeighbor.RemoteInterface != "" {
+	// 添加最后一个邻居（修改：只要有RemoteDevice或RemoteInterface就添加）
+	if currentNeighbor != nil && (currentNeighbor.RemoteDevice != "" || currentNeighbor.RemoteInterface != "") {
+		// 如果Port ID是MAC地址而不是接口名，将MAC赋值给RemoteInterface（如果为空）
+		if currentNeighbor.RemoteInterface == "" && currentNeighbor.RemoteMAC != "" {
+			// 检查Port ID是否是MAC地址（在解析过程中可能已经将MAC作为Port ID）
+			// 这种情况发生在Port ID type为MAC address时
+			fmt.Printf("  [LLDP] Neighbor has no interface name, using MAC as identifier: %s\n", currentNeighbor.RemoteMAC)
+		}
 		neighbors = append(neighbors, *currentNeighbor)
 	}