feat: add summary dashboard history charts

Sources/Model/History/MetricSample.swift

@@ -0,0 +1,35 @@
+//
+//  MetricSample.swift
+//  iKeyMon
+//
+//  Created by tracer on 21.04.26.
+//
+
+import Foundation
+import SwiftData
+
+@Model
+final class MetricSample {
+    var serverID: UUID
+    var timestamp: Date
+    var cpuPercent: Double
+    var memoryPercent: Double
+    var swapPercent: Double
+    var diskPercent: Double
+
+    init(
+        serverID: UUID,
+        timestamp: Date = .now,
+        cpuPercent: Double,
+        memoryPercent: Double,
+        swapPercent: Double,
+        diskPercent: Double
+    ) {
+        self.serverID = serverID
+        self.timestamp = timestamp
+        self.cpuPercent = cpuPercent
+        self.memoryPercent = memoryPercent
+        self.swapPercent = swapPercent
+        self.diskPercent = diskPercent
+    }
+}