add dedicated S.M.A.R.T. page with persistent device storage

- Add /smart route to view SMART data across all systems
- Store SMART devices in new smart_devices collection
- Auto-fetch SMART data when system first comes online
- Add refresh/delete actions per device with realtime updates
- Add navbar and command palette entries

internal/hub/systems/system_smart.go

@@ -0,0 +1,132 @@
+package systems
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"strings"
+	"time"
+
+	"github.com/fxamacker/cbor/v2"
+	"github.com/henrygd/beszel/internal/common"
+	"github.com/henrygd/beszel/internal/entities/smart"
+	"github.com/pocketbase/pocketbase/core"
+	"golang.org/x/crypto/ssh"
+)
+
+// FetchSmartDataFromAgent fetches SMART data from the agent
+func (sys *System) FetchSmartDataFromAgent() (map[string]smart.SmartData, 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]smart.SmartData
+	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
+		}
+		result = resp.SmartData
+		return false, nil
+	})
+	return result, err
+}
+
+// FetchAndSaveSmartDevices fetches SMART data from the agent and saves it to the database
+func (sys *System) FetchAndSaveSmartDevices() error {
+	smartData, err := sys.FetchSmartDataFromAgent()
+	if err != nil || len(smartData) == 0 {
+		return err
+	}
+	return sys.saveSmartDevices(smartData)
+}
+
+// saveSmartDevices saves SMART device data to the smart_devices collection
+func (sys *System) saveSmartDevices(smartData map[string]smart.SmartData) error {
+	if len(smartData) == 0 {
+		return nil
+	}
+
+	hub := sys.manager.hub
+	collection, err := hub.FindCachedCollectionByNameOrId("smart_devices")
+	if err != nil {
+		return err
+	}
+
+	for deviceKey, device := range smartData {
+		if err := sys.upsertSmartDeviceRecord(collection, deviceKey, device); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (sys *System) upsertSmartDeviceRecord(collection *core.Collection, deviceKey string, device smart.SmartData) error {
+	hub := sys.manager.hub
+	recordID := makeStableHashId(sys.Id, deviceKey)
+
+	record, err := hub.FindRecordById(collection, recordID)
+	if err != nil {
+		if !errors.Is(err, sql.ErrNoRows) {
+			return err
+		}
+		record = core.NewRecord(collection)
+		record.Set("id", recordID)
+	}
+
+	name := device.DiskName
+	if name == "" {
+		name = deviceKey
+	}
+
+	powerOnHours, powerCycles := extractPowerMetrics(device.Attributes)
+	record.Set("system", sys.Id)
+	record.Set("name", name)
+	record.Set("model", device.ModelName)
+	record.Set("state", device.SmartStatus)
+	record.Set("capacity", device.Capacity)
+	record.Set("temp", device.Temperature)
+	record.Set("firmware", device.FirmwareVersion)
+	record.Set("serial", device.SerialNumber)
+	record.Set("type", device.DiskType)
+	record.Set("hours", powerOnHours)
+	record.Set("cycles", powerCycles)
+	record.Set("attributes", device.Attributes)
+
+	return hub.SaveNoValidate(record)
+}
+
+// extractPowerMetrics extracts power on hours and power cycles from SMART attributes
+func extractPowerMetrics(attributes []*smart.SmartAttribute) (powerOnHours, powerCycles uint64) {
+	for _, attr := range attributes {
+		nameLower := strings.ToLower(attr.Name)
+		if powerOnHours == 0 && (strings.Contains(nameLower, "poweronhours") || strings.Contains(nameLower, "power_on_hours")) {
+			powerOnHours = attr.RawValue
+		}
+		if powerCycles == 0 && ((strings.Contains(nameLower, "power") && strings.Contains(nameLower, "cycle")) || strings.Contains(nameLower, "startstopcycles")) {
+			powerCycles = attr.RawValue
+		}
+		if powerOnHours > 0 && powerCycles > 0 {
+			break
+		}
+	}
+	return
+}