feat: 更新API相关逻辑及视图结构

- 在Info.plist中新增API签名密钥配置。
- 将Splash视图替换为SplashV2，优化启动逻辑和用户体验。
- 更新API请求中的User-Agent逻辑，使用UserAgentProvider提供的动态值。
- 在APILogger中添加敏感信息脱敏处理，增强安全性。
- 新增CreateFeedPage视图，支持用户发布动态功能。
- 更新MainPage和Splash视图的导航逻辑，整合统一的AppRoute管理。
- 移除冗余的SplashFeature视图，提升代码整洁性和可维护性。

yana/Utils/Network/DeviceContext.swift

@@ -0,0 +1,54 @@
+import Foundation
+import UIKit
+
+@MainActor
+struct DeviceContext: Sendable {
+    let languageCode: String
+    let osName: String
+    let osVersion: String
+    let deviceModel: String
+    let deviceId: String
+    let appName: String
+    let appVersion: String
+    let channel: String
+    let screenScale: String
+
+    static let shared: DeviceContext = {
+        // 仅在主线程读取一次 UIKit/Bundle 信息
+        let language = Locale.current.language.languageCode?.identifier ?? "en"
+        let osName = "iOS"
+        let osVersion = UIDevice.current.systemVersion
+        let deviceModel = UIDevice.current.model
+        let deviceId = UIDevice.current.identifierForVendor?.uuidString ?? UUID().uuidString
+        let appName = Bundle.main.infoDictionary?["CFBundleName"] as? String ?? "eparty"
+        let appVersion = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "1.0.0"
+        #if DEBUG
+        let channel = "molistar_enterprise"
+        #else
+        let channel = "appstore"
+        #endif
+        let scale = String(format: "%.2f", Double(UIScreen.main.scale))
+
+        return DeviceContext(
+            languageCode: language,
+            osName: osName,
+            osVersion: osVersion,
+            deviceModel: deviceModel,
+            deviceId: deviceId,
+            appName: appName,
+            appVersion: appVersion,
+            channel: channel,
+            screenScale: scale
+        )
+    }()
+}
+
+enum UserAgentProvider {
+    @MainActor
+    static func userAgent() -> String {
+        let ctx = DeviceContext.shared
+        return "\(ctx.appName)/\(ctx.appVersion) (\(ctx.deviceModel); \(ctx.osName) \(ctx.osVersion); Scale/\(ctx.screenScale))"
+    }
+}
+
+