feat: reboot button in Settings with password confirmation

- system.reboot RPC endpoint requires password re-verification
- Uses systemd path unit pattern (tor-helper.sh) for privilege escalation
- 2-second delay before reboot to allow RPC response to reach client
- Clean UI: password input modal, loading state, error feedback

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/src/views/Settings.vue

@@ -991,6 +991,51 @@
       </div>
     </div>
 
+    <!-- Reboot Section -->
+    <div class="path-option-card px-6 py-6 mt-6">
+      <div class="flex items-center justify-between">
+        <div>
+          <h2 class="text-xl font-semibold text-white/90 mb-1">Reboot</h2>
+          <p class="text-sm text-white/60">Restart the machine. All containers will restart automatically.</p>
+        </div>
+        <button
+          class="glass-button px-6 py-2 text-sm"
+          :disabled="rebooting"
+          @click="showRebootConfirm = true"
+        >
+          {{ rebooting ? 'Rebooting...' : 'Reboot' }}
+        </button>
+      </div>
+    </div>
+
+    <!-- Reboot Confirmation Modal -->
+    <Teleport to="body">
+      <div v-if="showRebootConfirm" class="fixed inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm" @click.self="showRebootConfirm = false">
+        <div class="glass-card px-8 py-8 max-w-md mx-4">
+          <h3 class="text-lg font-semibold text-white/90 mb-3">Reboot Node</h3>
+          <p class="text-sm text-white/60 mb-4">Enter your password to confirm reboot. The node will be temporarily unavailable.</p>
+          <input
+            v-model="rebootPassword"
+            type="password"
+            class="w-full px-3 py-2 rounded-lg bg-white/10 text-white border border-white/20 focus:border-orange-500 focus:ring-1 focus:ring-orange-500 mb-4"
+            placeholder="Password"
+            @keydown.enter="performReboot"
+          />
+          <p v-if="rebootError" class="text-sm text-red-400 mb-3">{{ rebootError }}</p>
+          <div class="flex gap-3 justify-end">
+            <button class="glass-button" @click="showRebootConfirm = false">Cancel</button>
+            <button
+              class="glass-button px-6"
+              :disabled="rebooting || !rebootPassword"
+              @click="performReboot"
+            >
+              {{ rebooting ? 'Rebooting...' : 'Confirm Reboot' }}
+            </button>
+          </div>
+        </div>
+      </div>
+    </Teleport>
+
     <!-- Factory Reset Section -->
     <div class="path-option-card px-6 py-6 mt-6 border-red-500/30">
       <h2 class="text-xl font-semibold text-red-400/90 mb-3">Factory Reset</h2>
@@ -1048,6 +1093,25 @@ const router = useRouter()
 const { t, locale } = useI18n()
 const store = useAppStore()
 
+// Reboot
+const showRebootConfirm = ref(false)
+const rebooting = ref(false)
+const rebootPassword = ref('')
+const rebootError = ref('')
+async function performReboot() {
+  if (!rebootPassword.value) return
+  rebooting.value = true
+  rebootError.value = ''
+  try {
+    await rpcClient.call({ method: 'system.reboot', params: { password: rebootPassword.value } })
+    showRebootConfirm.value = false
+    rebootPassword.value = ''
+  } catch (e) {
+    rebootError.value = e instanceof Error ? e.message : 'Reboot failed'
+    rebooting.value = false
+  }
+}
+
 // Factory Reset
 const showFactoryResetConfirm = ref(false)
 const factoryResetLoading = ref(false)