Add submit-task flow aligned with Android and extract profile edit page.

Implement task creation with cloud/local media, order linking, and OSS upload; wire home entry and move profile nickname/avatar editing to ProfileEditViewController.

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

suixinkan/Features/Task/ViewModels/TaskOrderSelectViewModel.swift

@@ -0,0 +1,70 @@
+//
+//  TaskOrderSelectViewModel.swift
+//  suixinkan
+//
+
+import Foundation
+
+/// 任务关联订单选择 ViewModel，对齐 Android `OrderSelectViewModel`。
+final class TaskOrderSelectViewModel {
+
+    private(set) var orders: [AvailableOrder] = []
+    private(set) var selectedOrderNumber: String?
+    private(set) var isLoading = false
+
+    var onStateChange: (() -> Void)?
+    var onShowMessage: ((String) -> Void)?
+
+    private let appStore: AppStore
+
+    init(appStore: AppStore = .shared, initialOrderNumber: String? = nil) {
+        self.appStore = appStore
+        let trimmed = initialOrderNumber?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
+        selectedOrderNumber = trimmed.isEmpty ? nil : trimmed
+    }
+
+    /// 拉取可选订单列表。
+    func loadOrders(api: TaskAPI) async {
+        isLoading = true
+        notifyStateChange()
+        defer {
+            isLoading = false
+            notifyStateChange()
+        }
+
+        let scenicId = appStore.currentScenicId
+        guard scenicId > 0 else {
+            orders = []
+            onShowMessage?("请先选择景区")
+            return
+        }
+
+        do {
+            orders = try await api.availableOrders(scenicId: scenicId)
+        } catch is CancellationError {
+            return
+        } catch {
+            orders = []
+            onShowMessage?(error.localizedDescription)
+        }
+    }
+
+    /// 切换订单选中状态，再次点击同一项则取消。
+    func toggleSelection(orderNumber: String) {
+        if selectedOrderNumber == orderNumber {
+            selectedOrderNumber = nil
+        } else {
+            selectedOrderNumber = orderNumber
+        }
+        notifyStateChange()
+    }
+
+    /// 确认选择并返回订单号。
+    func confirmedOrderNumber() -> String? {
+        selectedOrderNumber
+    }
+
+    private func notifyStateChange() {
+        onStateChange?()
+    }
+}