Refactor project structure and API

Model/API/BaseAPI.swift

@@ -0,0 +1,66 @@
+//
+//  BaseAPI.swift
+//  iKeyMon
+//
+//  Created by tracer on 13.11.25.
+//
+
+
+import Foundation
+
+protocol ServerAPIProtocol {
+    associatedtype LoadType: Codable
+    associatedtype MemoryType: Codable
+    associatedtype UtilizationType: Codable
+    
+    func fetchSystemInfo() async throws -> SystemInfo
+    func fetchLoad() async throws -> LoadType
+    func fetchMemory() async throws -> MemoryType
+    func fetchUtilization() async throws -> UtilizationType
+}
+
+struct SystemInfo: Codable {
+    let version: String
+    let timestamp: Date
+    let hostname: String
+}
+
+class BaseAPIClient {
+    let baseURL: URL
+    let session: URLSession
+    
+    init(baseURL: URL, session: URLSession = .shared) {
+        self.baseURL = baseURL
+        self.session = session
+    }
+    
+    func performRequest<T: Codable>(_ request: URLRequest, responseType: T.Type) async throws -> T {
+        let (data, response) = try await session.data(for: request)
+        
+        guard let httpResponse = response as? HTTPURLResponse else {
+            throw APIError.invalidResponse
+        }
+        
+        guard 200...299 ~= httpResponse.statusCode else {
+            throw APIError.httpError(httpResponse.statusCode)
+        }
+        
+        return try JSONDecoder().decode(T.self, from: data)
+    }
+}
+
+enum APIError: Error, LocalizedError {
+    case invalidURL
+    case invalidResponse
+    case httpError(Int)
+    case decodingError(Error)
+    
+    var errorDescription: String? {
+        switch self {
+        case .invalidURL: return "Invalid URL"
+        case .invalidResponse: return "Invalid response"
+        case .httpError(let code): return "HTTP Error: \(code)"
+        case .decodingError(let error): return "Decoding error: \(error.localizedDescription)"
+        }
+    }
+}