Add instant payment collection flow aligned with Android.

Implement收款详情与收款记录 pages with pay-code API, QR generation, amount setting, and record grouping so merchants can collect payments from the home quick action.

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

suixinkan/Common/PhotoLibrarySaver.swift

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+//
+//  PhotoLibrarySaver.swift
+//  suixinkan
+//
+
+import Photos
+import UIKit
+
+/// 将图片保存到系统相册，供收款二维码保存使用。
+enum PhotoLibrarySaver {
+
+    /// 请求写入权限并将图片保存到相册。
+    static func saveImage(_ image: UIImage) async -> Bool {
+        let status = await requestAuthorizationIfNeeded()
+        guard status == .authorized || status == .limited else {
+            return false
+        }
+
+        return await withCheckedContinuation { continuation in
+            PHPhotoLibrary.shared().performChanges({
+                PHAssetChangeRequest.creationRequestForAsset(from: image)
+            }, completionHandler: { success, _ in
+                continuation.resume(returning: success)
+            })
+        }
+    }
+
+    private static func requestAuthorizationIfNeeded() async -> PHAuthorizationStatus {
+        let current = PHPhotoLibrary.authorizationStatus(for: .addOnly)
+        switch current {
+        case .notDetermined:
+            return await PHPhotoLibrary.requestAuthorization(for: .addOnly)
+        default:
+            return current
+        }
+    }
+}

suixinkan/Common/QRCodeGenerator.swift

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+//
+//  QRCodeGenerator.swift
+//  suixinkan
+//
+
+import CoreImage
+import UIKit
+
+/// 圆角样式二维码生成器，对齐 Android `QrCodeUtils.generateStyledQrBitmap`。
+enum QRCodeGenerator {
+
+    private static let defaultPixelSize = 580
+    private static let defaultCornerRadius: CGFloat = 24
+
+    /// 根据内容生成带圆角背景的二维码图片。
+    static func generateStyledQRCode(
+        content: String,
+        pixelSize: Int = defaultPixelSize,
+        backgroundColor: UIColor = AppColor.inputBackground,
+        cornerRadius: CGFloat = defaultCornerRadius
+    ) -> UIImage? {
+        guard !content.isEmpty,
+              let qrImage = makeQRCodeImage(from: content, pixelSize: pixelSize) else {
+            return nil
+        }
+
+        let size = CGSize(width: pixelSize, height: pixelSize)
+        let format = UIGraphicsImageRendererFormat()
+        format.scale = 1
+        let renderer = UIGraphicsImageRenderer(size: size, format: format)
+        return renderer.image { context in
+            let rect = CGRect(origin: .zero, size: size)
+            let path = UIBezierPath(roundedRect: rect, cornerRadius: cornerRadius)
+            backgroundColor.setFill()
+            path.fill()
+
+            context.cgContext.saveGState()
+            path.addClip()
+            qrImage.draw(in: rect)
+            context.cgContext.restoreGState()
+        }
+    }
+
+    private static func makeQRCodeImage(from content: String, pixelSize: Int) -> UIImage? {
+        guard let filter = CIFilter(name: "CIQRCodeGenerator") else { return nil }
+        let data = Data(content.utf8)
+        filter.setValue(data, forKey: "inputMessage")
+        filter.setValue("M", forKey: "inputCorrectionLevel")
+        guard let outputImage = filter.outputImage else { return nil }
+
+        let scale = CGFloat(pixelSize) / outputImage.extent.width
+        let scaledImage = outputImage.transformed(by: CGAffineTransform(scaleX: scale, y: scale))
+        let context = CIContext()
+        guard let cgImage = context.createCGImage(scaledImage, from: scaledImage.extent) else {
+            return nil
+        }
+        return UIImage(cgImage: cgImage)
+    }
+}