fix: manual host creation and improve host identification

- Add machine_id support for manual host creation from GUI
- Generate temporary 'pending-{uuid}' machine_id for new hosts
- Agent now collects and sends machine_id on every update
- Backend replaces pending machine_id with real one on first agent connection
- Remove unnecessary duplicate name check (friendly_name can be duplicated)
- Add get_machine_id() function to agent (reads from /etc/machine-id, /var/lib/dbus/machine-id, or generates fallback)
- Display IP address in Network tab on host details page
- Fix network tab visibility conditions to include host.ip

This ensures proper host identification using machine_id while maintaining backwards compatibility with API credentials as the primary authentication method.

agents/patchmon-agent.sh

@@ -56,6 +56,28 @@ warning() {
     log "WARNING: $1"
 }
 
+# Get or generate machine ID
+get_machine_id() {
+    # Try standard locations for machine-id
+    if [[ -f /etc/machine-id ]]; then
+        cat /etc/machine-id
+    elif [[ -f /var/lib/dbus/machine-id ]]; then
+        cat /var/lib/dbus/machine-id
+    else
+        # Fallback: generate from hardware UUID or hostname+MAC
+        if command -v dmidecode &> /dev/null; then
+            local uuid=$(dmidecode -s system-uuid 2>/dev/null | tr -d ' -' | tr '[:upper:]' '[:lower:]')
+            if [[ -n "$uuid" && "$uuid" != "notpresent" ]]; then
+                echo "$uuid"
+                return
+            fi
+        fi
+        # Last resort: hash hostname + primary MAC address
+        local primary_mac=$(ip link show | grep -oP '(?<=link/ether\s)[0-9a-f:]+' | head -1 | tr -d ':')
+        echo "$HOSTNAME-$primary_mac" | sha256sum | cut -d' ' -f1 | cut -c1-32
+    fi
+}
+
 # Check if running as root
 check_root() {
     if [[ $EUID -ne 0 ]]; then
@@ -865,6 +887,9 @@ send_update() {
     
     # Merge all JSON objects into one
     local merged_json=$(echo "$hardware_json $network_json $system_json" | jq -s '.[0] * .[1] * .[2]')
+    # Get machine ID
+    local machine_id=$(get_machine_id)
+    
     # Create the base payload and merge with system info
     local base_payload=$(cat <<EOF
 {
@@ -875,7 +900,8 @@ send_update() {
     "hostname": "$HOSTNAME",
     "ip": "$IP_ADDRESS",
     "architecture": "$ARCHITECTURE",
-    "agentVersion": "$AGENT_VERSION"
+    "agentVersion": "$AGENT_VERSION",
+    "machineId": "$machine_id"
 }
 EOF
 )

backend/src/routes/hostRoutes.js

@@ -172,15 +172,6 @@ router.post(
 			// Generate unique API credentials for this host
 			const { apiId, apiKey } = generateApiCredentials();
 
-			// Check if host already exists
-			const existingHost = await prisma.hosts.findUnique({
-				where: { friendly_name: friendly_name },
-			});
-
-			if (existingHost) {
-				return res.status(409).json({ error: "Host already exists" });
-			}
-
 			// If hostGroupId is provided, verify the group exists
 			if (hostGroupId) {
 				const hostGroup = await prisma.host_groups.findUnique({
@@ -196,6 +187,7 @@ router.post(
 			const host = await prisma.hosts.create({
 				data: {
 					id: uuidv4(),
+					machine_id: `pending-${uuidv4()}`, // Temporary placeholder until agent connects with real machine_id
 					friendly_name: friendly_name,
 					os_type: "unknown", // Will be updated when agent connects
 					os_version: "unknown", // Will be updated when agent connects
@@ -321,6 +313,10 @@ router.post(
 			.optional()
 			.isArray()
 			.withMessage("Load average must be an array"),
+		body("machineId")
+			.optional()
+			.isString()
+			.withMessage("Machine ID must be a string"),
 	],
 	async (req, res) => {
 		try {
@@ -338,6 +334,11 @@ router.post(
 				updated_at: new Date(),
 			};
 
+			// Update machine_id if provided and current one is a placeholder
+			if (req.body.machineId && host.machine_id.startsWith("pending-")) {
+				updateData.machine_id = req.body.machineId;
+			}
+
 			// Basic system info
 			if (req.body.osType) updateData.os_type = req.body.osType;
 			if (req.body.osVersion) updateData.os_version = req.body.osVersion;

frontend/src/pages/HostDetail.jsx

@@ -466,11 +466,23 @@ const HostDetail = () => {
 
 							{/* Network Information */}
 							{activeTab === "network" &&
-								(host.gateway_ip ||
+								(host.ip ||
+									host.gateway_ip ||
 									host.dns_servers ||
 									host.network_interfaces) && (
 									<div className="space-y-4">
 										<div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
+											{host.ip && (
+												<div>
+													<p className="text-xs text-secondary-500 dark:text-secondary-300">
+														IP Address
+													</p>
+													<p className="font-medium text-secondary-900 dark:text-white font-mono text-sm">
+														{host.ip}
+													</p>
+												</div>
+											)}
+
 											{host.gateway_ip && (
 												<div>
 													<p className="text-xs text-secondary-500 dark:text-secondary-300">
@@ -802,6 +814,7 @@ const HostDetail = () => {
 
 							{activeTab === "network" &&
 								!(
+									host.ip ||
 									host.gateway_ip ||
 									host.dns_servers ||
 									host.network_interfaces