feat(daemon): Add UPSD (NUT) protocol support, Proxmox VM shutdown action, pause/resume monitoring, and network-loss/unreachable handling; bump config version to 4.2

ts/constants.ts

@@ -103,6 +103,62 @@ export const HTTP_SERVER = {
   DEFAULT_PATH: '/ups-status',
 } as const;
 
+/**
+ * Network failure detection constants
+ */
+export const NETWORK = {
+  /** Number of consecutive failures before marking UPS as unreachable */
+  CONSECUTIVE_FAILURE_THRESHOLD: 3,
+
+  /** Maximum tracked consecutive failures (prevents overflow) */
+  MAX_CONSECUTIVE_FAILURES: 100,
+} as const;
+
+/**
+ * UPSD/NIS protocol constants
+ */
+export const UPSD = {
+  /** Default UPSD port (NUT standard) */
+  DEFAULT_PORT: 3493,
+
+  /** Default timeout in milliseconds */
+  DEFAULT_TIMEOUT_MS: 5000,
+
+  /** Default NUT device name */
+  DEFAULT_UPS_NAME: 'ups',
+} as const;
+
+/**
+ * Pause/resume constants
+ */
+export const PAUSE = {
+  /** Path to the pause state file */
+  FILE_PATH: '/etc/nupst/pause',
+
+  /** Maximum pause duration (24 hours) */
+  MAX_DURATION_MS: 24 * 60 * 60 * 1000,
+} as const;
+
+/**
+ * Proxmox VM shutdown constants
+ */
+export const PROXMOX = {
+  /** Default Proxmox API port */
+  DEFAULT_PORT: 8006,
+
+  /** Default Proxmox host */
+  DEFAULT_HOST: 'localhost',
+
+  /** Default timeout for VM/CT shutdown in seconds */
+  DEFAULT_STOP_TIMEOUT_SECONDS: 120,
+
+  /** Poll interval for checking VM/CT status in seconds */
+  STATUS_POLL_INTERVAL_SECONDS: 5,
+
+  /** Proxmox API base path */
+  API_BASE: '/api2/json',
+} as const;
+
 /**
  * UI/Display constants
  */