Integrate CYLTabBar center scan button and unify UIKit navigation.

Add CYLTabBarController with a global scan entry, promote MainTabBarController to the window root after login, replace RouterPath-based navigation with AppNavigator, and fix Profile diffable cell reconfiguration crashes.

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkan_iosTests/MainScanPlusButtonTests.swift

@@ -0,0 +1,58 @@
+//
+//  MainScanPlusButtonTests.swift
+//  suixinkanTests
+//
+
+import XCTest
+@testable import suixinkan_ios
+
+/// 主 TabBar 中间扫码按钮测试，覆盖 CYL PlusButton 配置。
+@MainActor
+final class MainScanPlusButtonTests: XCTestCase {
+
+    /// 测试扫码按钮位于订单与数据 Tab 之间的视觉槽位。
+    func testIndexOfPlusButtonInTabBarIsBetweenOrdersAndStatistics() {
+        XCTAssertEqual(MainScanPlusButton.indexOfPlusButtonInTabBar(), 2)
+    }
+
+    /// 测试扫码按钮 accessibility 标识与参考工程一致。
+    func testPlusButtonAccessibilityIdentifier() {
+        guard let button = MainScanPlusButton.plusButton() as? UIButton else {
+            XCTFail("plusButton 应返回 UIButton 实例")
+            return
+        }
+
+        XCTAssertEqual(button.accessibilityIdentifier, "main.scan")
+        XCTAssertEqual(button.accessibilityLabel, "扫码核销")
+    }
+
+    /// 测试主 Tab 容器加载时，CYL 控制器数组与 Tab 属性数组保持一致。
+    func testMainTabBarControllerLoadsWithMatchingCYLAttributes() {
+        let services = AppServices(apiClient: APIClient(session: MainTabRecordingURLSession()))
+        let controller = MainTabBarController(services: services)
+
+        controller.loadViewIfNeeded()
+
+        for tab in AppTab.allCases {
+            XCTAssertNotNil(controller.navigationController(for: tab))
+            XCTAssertEqual(
+                controller.navigationController(for: tab)?.tabBarItem.accessibilityIdentifier,
+                "main.tab.\(tab.rawValue)"
+            )
+        }
+    }
+}
+
+/// 主 Tab 测试使用的空网络会话，确保容器加载不触发真实请求。
+private final class MainTabRecordingURLSession: URLSessionProtocol {
+    /// 返回空成功响应。
+    func data(for request: URLRequest) async throws -> (Data, URLResponse) {
+        let response = HTTPURLResponse(
+            url: request.url ?? URL(string: "https://example.com")!,
+            statusCode: 200,
+            httpVersion: nil,
+            headerFields: nil
+        )!
+        return (Data(), response)
+    }
+}