refactored code structure

Sources/Model/API/ApiManager.swift

@@ -0,0 +1,64 @@
+//
+//  ApiManager.swift
+//  iKeyMon
+//
+//  Created by tracer on 13.11.25.
+//
+
+import Foundation
+import Combine
+
+@MainActor
+class APIManager: ObservableObject {
+    @Published var isConnected = false
+    @Published var currentVersion: String = ""
+    @Published var lastError: Error?
+    
+    private var api: AnyServerAPI?
+    private let baseURL: URL
+    
+    init(baseURL: URL) {
+        self.baseURL = baseURL
+    }
+    
+    func connect() async {
+        do {
+            self.api = try await APIFactory.detectAndCreateAPI(baseURL: baseURL)
+            let systemInfo = try await api!.fetchSystemInfo()
+            self.currentVersion = systemInfo.version
+            self.isConnected = true
+            self.lastError = nil
+        } catch {
+            self.isConnected = false
+            self.lastError = error
+            self.api = nil
+        }
+    }
+    
+    func disconnect() {
+        self.api = nil
+        self.isConnected = false
+        self.currentVersion = ""
+        self.lastError = nil
+    }
+    
+    func fetchSystemInfo() async throws -> SystemInfo {
+        guard let api = api else { throw APIError.invalidResponse }
+        return try await api.fetchSystemInfo()
+    }
+    
+    func fetchLoad() async throws -> Any {
+        guard let api = api else { throw APIError.invalidResponse }
+        return try await api.fetchLoadData()
+    }
+    
+    func fetchMemory() async throws -> Any {
+        guard let api = api else { throw APIError.invalidResponse }
+        return try await api.fetchMemoryData()
+    }
+    
+    func fetchUtilization() async throws -> Any {
+        guard let api = api else { throw APIError.invalidResponse }
+        return try await api.fetchUtilizationData()
+    }
+}