Replace CYLTabBarController with native UITabBarController for main tabs.

Use a system scan tab slot with MainScanTabItem interception so scanner presentation no longer depends on CYL PlusButton, and remove the CYLTabBarController pod dependency.

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

suixinkan_iosTests/MainScanTabItemTests.swift

@@ -0,0 +1,115 @@
+//
+//  MainScanTabItemTests.swift
+//  suixinkanTests
+//
+
+import XCTest
+@testable import suixinkan_ios
+
+/// 主 TabBar 中间扫码入口测试，覆盖系统 TabBar 槽位配置。
+@MainActor
+final class MainScanTabItemTests: XCTestCase {
+
+    /// 测试主 Tab 容器加载后包含四个业务 Tab 和中间扫码入口。
+    func testMainTabBarControllerLoadsFiveSystemTabItems() {
+        let services = AppServices(apiClient: APIClient(session: MainTabRecordingURLSession()))
+        let controller = MainTabBarController(services: services)
+
+        controller.loadViewIfNeeded()
+
+        XCTAssertEqual(controller.viewControllers?.count, 5)
+        for tab in AppTab.allCases {
+            XCTAssertNotNil(controller.navigationController(for: tab))
+            XCTAssertEqual(
+                controller.navigationController(for: tab)?.tabBarItem.accessibilityIdentifier,
+                "main.tab.\(tab.rawValue)"
+            )
+        }
+    }
+
+    /// 测试扫码入口位于订单与数据之间，并保留指定无障碍标识。
+    func testScanTabItemIsCenteredBetweenOrdersAndStatistics() throws {
+        let services = AppServices(apiClient: APIClient(session: MainTabRecordingURLSession()))
+        let controller = MainTabBarController(services: services)
+
+        controller.loadViewIfNeeded()
+
+        let scanItem = try XCTUnwrap(controller.viewControllers?[2].tabBarItem)
+        XCTAssertEqual(scanItem.title, "扫码")
+        XCTAssertEqual(scanItem.accessibilityIdentifier, "main.scan")
+        XCTAssertEqual(scanItem.accessibilityLabel, "扫码核销")
+        XCTAssertNotNil(scanItem.image)
+        XCTAssertNotNil(scanItem.selectedImage)
+    }
+
+    /// 测试点击扫码槽位会被拦截且不改变当前选中页面。
+    func testSelectingScanTabPresentsScannerWithoutSelectingPlaceholder() throws {
+        let services = AppServices(apiClient: APIClient(session: MainTabRecordingURLSession()))
+        let controller = MainTabBarController(services: services)
+        var scanTapCount = 0
+        controller.onScanTabSelected = {
+            scanTapCount += 1
+        }
+
+        controller.loadViewIfNeeded()
+        controller.selectedIndex = 1
+
+        let scanController = try XCTUnwrap(controller.viewControllers?[2])
+        XCTAssertFalse(controller.tabBarController(controller, shouldSelect: scanController))
+        XCTAssertEqual(scanTapCount, 1)
+        XCTAssertEqual(controller.selectedIndex, 1)
+    }
+
+    /// 测试业务 Tab 仍允许系统 TabBar 正常选中。
+    func testSelectingBusinessTabIsAllowed() throws {
+        let services = AppServices(apiClient: APIClient(session: MainTabRecordingURLSession()))
+        let controller = MainTabBarController(services: services)
+
+        controller.loadViewIfNeeded()
+
+        let ordersController = try XCTUnwrap(controller.viewControllers?[1])
+        XCTAssertTrue(controller.tabBarController(controller, shouldSelect: ordersController))
+    }
+
+    /// 测试各 Tab 的图标资源可被加载并挂载到 tabBarItem。
+    func testMainTabBarControllerTabBarItemsHaveImages() {
+        let services = AppServices(apiClient: APIClient(session: MainTabRecordingURLSession()))
+        let controller = MainTabBarController(services: services)
+        controller.loadViewIfNeeded()
+
+        for tab in AppTab.allCases {
+            let item = controller.navigationController(for: tab)?.tabBarItem
+            XCTAssertNotNil(item?.image, "tab \(tab.rawValue) image should not be nil")
+            XCTAssertNotNil(item?.selectedImage, "tab \(tab.rawValue) selectedImage should not be nil")
+            XCTAssertGreaterThan(item?.image?.size.width ?? 0, 0)
+            XCTAssertGreaterThan(item?.selectedImage?.size.width ?? 0, 0)
+        }
+    }
+
+    /// 测试订单角标仍挂载在订单业务导航控制器的系统 TabBarItem 上。
+    func testOrderBadgeUsesOrdersNavigationTabBarItem() throws {
+        let services = AppServices(apiClient: APIClient(session: MainTabRecordingURLSession()))
+        let controller = MainTabBarController(services: services)
+
+        controller.loadViewIfNeeded()
+
+        let ordersNavigationController = try XCTUnwrap(controller.navigationController(for: .orders))
+        ordersNavigationController.tabBarItem.badgeValue = "3"
+
+        XCTAssertEqual(controller.viewControllers?[1].tabBarItem.badgeValue, "3")
+    }
+}
+
+/// 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)
+    }
+}