Soportar autenticacion SSH por clave privada

server.js

@@ -364,17 +364,15 @@ function runCommandWithInput(command, args, input, timeoutMs) {
 }
 
 async function sshMetrics(device) {
-  if (!device.password) {
-    throw new Error("Password SSH no configurada");
+  const hasPrivateKey = Boolean(device.privateKeyPath);
+  if (!hasPrivateKey && !device.password) {
+    throw new Error("Credenciales SSH no configuradas");
   }
 
   const timeoutMs = Math.max(2, config.sshTimeoutSeconds || 8) * 1000;
   const port = Number(device.port || 22);
   const destination = `${device.username || "pi"}@${device.host}`;
-  const args = [
-    "-p",
-    device.password,
-    "ssh",
+  const sshArgs = [
     "-o",
     "StrictHostKeyChecking=no",
     "-o",
@@ -388,7 +386,29 @@ async function sshMetrics(device) {
     "-s"
   ];
 
-  const { stdout } = await runCommandWithInput("sshpass", args, REMOTE_METRICS_SCRIPT, timeoutMs);
+  let command = "ssh";
+  let args = sshArgs;
+  if (hasPrivateKey) {
+    args = [
+      "-i",
+      device.privateKeyPath,
+      "-o",
+      "BatchMode=yes",
+      "-o",
+      "IdentitiesOnly=yes",
+      ...sshArgs
+    ];
+  } else {
+    command = "sshpass";
+    args = [
+      "-p",
+      device.password,
+      "ssh",
+      ...sshArgs
+    ];
+  }
+
+  const { stdout } = await runCommandWithInput(command, args, REMOTE_METRICS_SCRIPT, timeoutMs);
   const values = parseKeyValueOutput(stdout);
   const temp = toNumber(values.cpuTempC, 0);
   const loadAverage = String(values.loadAverage || "")