Add initial S.M.A.R.T. support

- Implement SmartManager for collecting SMART data from SATA and NVMe drives
- Add smartctl-based data collection with standby mode detection
- Support comprehensive SMART attributes parsing and storage
- Add hub API endpoint for fetching SMART data from agents
- Create SMART table UI with detailed disk information

Co-authored-by: geekifan <i@ifan.dev>

internal/hub/hub.go

@@ -256,6 +256,8 @@ func (h *Hub) registerApiRoutes(se *core.ServeEvent) error {
 	apiAuth.GET("/containers/logs", h.getContainerLogs)
 	// get container info
 	apiAuth.GET("/containers/info", h.getContainerInfo)
+	// get SMART data
+	apiAuth.GET("/smart", h.getSmartData)
 	return nil
 }
 
@@ -321,6 +323,24 @@ func (h *Hub) getContainerInfo(e *core.RequestEvent) error {
 	}, "info")
 }
 
+// getSmartData handles GET /api/beszel/smart requests
+func (h *Hub) getSmartData(e *core.RequestEvent) error {
+	systemID := e.Request.URL.Query().Get("system")
+	if systemID == "" {
+		return e.JSON(http.StatusBadRequest, map[string]string{"error": "system parameter is required"})
+	}
+	system, err := h.sm.GetSystem(systemID)
+	if err != nil {
+		return e.JSON(http.StatusNotFound, map[string]string{"error": "system not found"})
+	}
+	data, err := system.FetchSmartDataFromAgent()
+	if err != nil {
+		return e.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
+	}
+	e.Response.Header().Set("Cache-Control", "public, max-age=60")
+	return e.JSON(http.StatusOK, data)
+}
+
 // generates key pair if it doesn't exist and returns signer
 func (h *Hub) GetSSHKey(dataDir string) (ssh.Signer, error) {
 	if h.signer != nil {

internal/hub/systems/system.go

@@ -340,6 +340,45 @@ func (sys *System) FetchContainerLogsFromAgent(containerID string) (string, erro
 	return sys.fetchStringFromAgentViaSSH(common.GetContainerLogs, common.ContainerLogsRequest{ContainerID: containerID}, "no logs in response")
 }
 
+// FetchSmartDataFromAgent fetches SMART data from the agent
+func (sys *System) FetchSmartDataFromAgent() (map[string]any, error) {
+	// fetch via websocket
+	if sys.WsConn != nil && sys.WsConn.IsConnected() {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		return sys.WsConn.RequestSmartData(ctx)
+	}
+	// fetch via SSH
+	var result map[string]any
+	err := sys.runSSHOperation(5*time.Second, 1, func(session *ssh.Session) (bool, error) {
+		stdout, err := session.StdoutPipe()
+		if err != nil {
+			return false, err
+		}
+		stdin, stdinErr := session.StdinPipe()
+		if stdinErr != nil {
+			return false, stdinErr
+		}
+		if err := session.Shell(); err != nil {
+			return false, err
+		}
+		req := common.HubRequest[any]{Action: common.GetSmartData}
+		_ = cbor.NewEncoder(stdin).Encode(req)
+		_ = stdin.Close()
+		var resp common.AgentResponse
+		if err := cbor.NewDecoder(stdout).Decode(&resp); err != nil {
+			return false, err
+		}
+		// Convert to generic map for JSON response
+		result = make(map[string]any, len(resp.SmartData))
+		for k, v := range resp.SmartData {
+			result[k] = v
+		}
+		return false, nil
+	})
+	return result, err
+}
+
 // fetchDataViaSSH handles fetching data using SSH.
 // This function encapsulates the original SSH logic.
 // It updates sys.data directly upon successful fetch.

internal/hub/ws/handlers.go

@@ -115,6 +115,46 @@ func (ws *WsConn) RequestContainerInfo(ctx context.Context, containerID string)
 ////////////////////////////////////////////////////////////////////////////
 ////////////////////////////////////////////////////////////////////////////
 
+// RequestSmartData requests SMART data via WebSocket.
+func (ws *WsConn) RequestSmartData(ctx context.Context) (map[string]any, error) {
+	if !ws.IsConnected() {
+		return nil, gws.ErrConnClosed
+	}
+	req, err := ws.requestManager.SendRequest(ctx, common.GetSmartData, nil)
+	if err != nil {
+		return nil, err
+	}
+	var result map[string]any
+	handler := ResponseHandler(&smartDataHandler{result: &result})
+	if err := ws.handleAgentRequest(req, handler); err != nil {
+		return nil, err
+	}
+	return result, nil
+}
+
+// smartDataHandler parses SMART data map from AgentResponse
+type smartDataHandler struct {
+	BaseHandler
+	result *map[string]any
+}
+
+func (h *smartDataHandler) Handle(agentResponse common.AgentResponse) error {
+	if agentResponse.SmartData == nil {
+		return errors.New("no SMART data in response")
+	}
+	// convert to map[string]any for transport convenience in hub layer
+	out := make(map[string]any, len(agentResponse.SmartData))
+	for k, v := range agentResponse.SmartData {
+		out[k] = v
+	}
+	*h.result = out
+	return nil
+}
+
+////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////
+
 // fingerprintHandler implements ResponseHandler for fingerprint requests
 type fingerprintHandler struct {
 	result *common.FingerprintResponse