feat: 新增用户信息更新功能

- 在APIEndpoints中新增用户信息更新端点。
- 实现UpdateUserRequest和UpdateUserResponse结构体，支持用户信息更新请求和响应。
- 在APIService中添加updateUser方法，处理用户信息更新请求。
- 更新AppSettingFeature以支持头像和昵称的修改，整合用户信息更新逻辑。
- 在AppSettingView中实现头像选择和昵称编辑功能，提升用户体验。

yana/Views/AppSettingView.swift

@@ -1,31 +1,51 @@
 import SwiftUI
 import ComposableArchitecture
+import PhotosUI
 
 struct AppSettingView: View {
     let store: StoreOf<AppSettingFeature>
+    @State private var showPhotoPicker = false
+    @State private var selectedPhotoItem: PhotosPickerItem? = nil
+    @State private var showNicknameAlert = false
+    @State private var nicknameInput: String = ""
     
     var body: some View {
         WithViewStore(self.store, observe: { $0 }) { viewStore in
             ZStack {
                 Color(red: 22/255, green: 17/255, blue: 44/255).ignoresSafeArea()
-//                VStack(spacing: 0) {
+                VStack(spacing: 0) {
                     // 主要内容
                     VStack(spacing: 0) {
                         // 头像区域
                         avatarSection(viewStore: viewStore)
-                        
                         // 昵称设置项
                         nicknameSection(viewStore: viewStore)
-                        
                         // 其他设置项
                         settingsSection(viewStore: viewStore)
-                        
                         Spacer()
-                        
                         // 底部大按钮
                         logoutButton(viewStore: viewStore)
                     }
-//                }
+                }
+                // Loading & 错误提示
+                if viewStore.isUploadingAvatar || viewStore.isUpdatingUser {
+                    Color.black.opacity(0.3).ignoresSafeArea()
+                    ProgressView("正在上传/更新...")
+                        .progressViewStyle(CircularProgressViewStyle(tint: .white))
+                        .foregroundColor(.white)
+                        .scaleEffect(1.2)
+                }
+                if let error = viewStore.avatarUploadError ?? viewStore.updateUserError {
+                    VStack {
+                        Spacer()
+                        Text(error)
+                            .foregroundColor(.red)
+                            .padding()
+                            .background(Color.white.opacity(0.9))
+                            .cornerRadius(10)
+                        Spacer()
+                    }
+                }
             }
             .navigationTitle(NSLocalizedString("appSetting.title", comment: "Edit"))
             .navigationBarTitleDisplayMode(.inline)
@@ -51,6 +71,35 @@ struct AppSettingView: View {
                 isPresented: privacyPolicyBinding(viewStore: viewStore),
                 url: APIConfiguration.webURL(for: .privacyPolicy)
             )
+            // 头像选择器
+            .photosPicker(isPresented: $showPhotoPicker, selection: $selectedPhotoItem, matching: .images, photoLibrary: .shared())
+            .onChange(of: selectedPhotoItem) { newItem in
+                if let item = newItem {
+                    loadAndProcessImage(item: item) { data in
+                        if let data = data {
+                            viewStore.send(.avatarSelected(data))
+                        }
+                    }
+                }
+            }
+            // 昵称修改Alert
+            .alert("修改昵称", isPresented: $showNicknameAlert, actions: {
+                TextField("请输入昵称", text: $nicknameInput)
+                    .onChange(of: nicknameInput) { newValue in
+                        if newValue.count > 15 {
+                            nicknameInput = String(newValue.prefix(15))
+                        }
+                    }
+                Button("确定") {
+                    let trimmed = nicknameInput.trimmingCharacters(in: .whitespacesAndNewlines)
+                    if !trimmed.isEmpty && trimmed != viewStore.nickname {
+                        viewStore.send(.nicknameEditConfirmed(trimmed))
+                    }
+                }
+                Button("取消", role: .cancel) {}
+            }, message: {
+                Text("昵称最长15个字符")
+            })
         }
     }
     
@@ -60,7 +109,13 @@ struct AppSettingView: View {
     private func avatarSection(viewStore: ViewStoreOf<AppSettingFeature>) -> some View {
         ZStack(alignment: .bottomTrailing) {
             avatarImageView(viewStore: viewStore)
+                .onTapGesture {
+                    showPhotoPicker = true
+                }
             cameraButton
+                .onTapGesture {
+                    showPhotoPicker = true
+                }
         }
         .padding(.top, 24)
     }
@@ -141,7 +196,8 @@ struct AppSettingView: View {
             .padding(.horizontal, 32)
             .padding(.vertical, 18)
             .onTapGesture {
-                viewStore.send(.editNicknameTapped)
+                nicknameInput = viewStore.nickname
+                showNicknameAlert = true
             }
             
             Divider().background(Color.gray.opacity(0.3))
@@ -255,4 +311,34 @@ struct AppSettingView: View {
             send: AppSettingFeature.Action.privacyPolicyDismissed
         )
     }
+    
+    // MARK: - 图片处理
+    private func loadAndProcessImage(item: PhotosPickerItem, completion: @escaping (Data?) -> Void) {
+        item.loadTransferable(type: Data.self) { result in
+            guard let data = try? result.get(), let uiImage = UIImage(data: data) else {
+                completion(nil)
+                return
+            }
+            let square = cropToSquare(image: uiImage)
+            let resized = resizeImage(image: square, targetSize: CGSize(width: 180, height: 180))
+            let jpegData = resized.jpegData(compressionQuality: 0.8)
+            completion(jpegData)
+        }
+    }
+}
+
+// MARK: - 图片处理全局函数
+private func cropToSquare(image: UIImage) -> UIImage {
+    let size = min(image.size.width, image.size.height)
+    let x = (image.size.width - size) / 2
+    let y = (image.size.height - size) / 2
+    let cropRect = CGRect(x: x, y: y, width: size, height: size)
+    guard let cgImage = image.cgImage?.cropping(to: cropRect) else { return image }
+    return UIImage(cgImage: cgImage, scale: image.scale, orientation: image.imageOrientation)
+}
+private func resizeImage(image: UIImage, targetSize: CGSize) -> UIImage {
+    let renderer = UIGraphicsImageRenderer(size: targetSize)
+    return renderer.image { _ in
+        image.draw(in: CGRect(origin: .zero, size: targetSize))
+    }
 }