fix+build(client/windows): 复查修缮——一键构建脚本 + 修 README dart-define 漏项 + 清 lint

- 新增 client/windows/build.ps1：拉内核→带 --dart-define 构建→出安装包一键串联，
  规避 Release 漏 --dart-define 导致默认连 localhost、登录「网络请求失败」的坑。
- README：Release 命令补回 --dart-define 并加显式警告，指向一键脚本。
- 清 4 个 lint warning：desktop_vpn_bridge 多余 cast→pattern match、去多余非空断言；
  nav_sidebar 删未用 import；vpn_bridge_mock 加 killSwitchEnabled getter。
- 同步 window_manager/tray_manager/screen_retriever 插件注册生成文件(win+macos)。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/bridge/desktop_vpn_bridge.dart

@@ -213,8 +213,8 @@ class DesktopVpnBridge implements VpnBridge {
     _reconnectTimer = null;
     _kernelStatusSub?.cancel();
     _kernelStatusSub = null;
-    if (_kernel is DesktopKernelProcess) {
+    if (_kernel case final DesktopKernelProcess k) {
-      (_kernel as DesktopKernelProcess).dispose();
+      k.dispose();
     }
   }
 
@@ -350,7 +350,7 @@ class DesktopVpnBridge implements VpnBridge {
 
   Future<Directory> _resolveConfigDir() async {
     if (_configDirOverride != null) {
-      return Directory(_configDirOverride!);
+      return Directory(_configDirOverride);
     }
     return _defaultConfigDir();
   }

client/lib/bridge/vpn_bridge_mock.dart

@@ -121,6 +121,9 @@ class VpnBridgeMock implements VpnBridge {
     _killSwitch = on;
   }
 
+  /// 测试可读：mock 记录的 kill-switch 状态。
+  bool get killSwitchEnabled => _killSwitch;
+
   @override
   Stream<VpnStatus> get statusStream => _statusCtrl.stream;
 

client/lib/widgets/nav_sidebar.dart

@@ -8,7 +8,6 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../pangolin_theme.dart';
 import '../state/app_providers.dart';
 import '../state/navigation_provider.dart';
-import 'pangolin_icons.dart';
 import 'pangolin_logo.dart';
 import 'plan_badge_card.dart';
 

client/macos/Flutter/GeneratedPluginRegistrant.swift

@@ -7,10 +7,16 @@ import Foundation
 
 import flutter_secure_storage_macos
 import package_info_plus
+import screen_retriever_macos
 import shared_preferences_foundation
+import tray_manager
+import window_manager
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   FlutterSecureStoragePlugin.register(with: registry.registrar(forPlugin: "FlutterSecureStoragePlugin"))
   FPPPackageInfoPlusPlugin.register(with: registry.registrar(forPlugin: "FPPPackageInfoPlusPlugin"))
+  ScreenRetrieverMacosPlugin.register(with: registry.registrar(forPlugin: "ScreenRetrieverMacosPlugin"))
   SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))
+  TrayManagerPlugin.register(with: registry.registrar(forPlugin: "TrayManagerPlugin"))
+  WindowManagerPlugin.register(with: registry.registrar(forPlugin: "WindowManagerPlugin"))
 }

client/windows/README.md

@@ -49,10 +49,23 @@ flutter run -d windows --dart-define=PANGOLIN_API_URL=http://<后端IP>:8080
 
 ## 打包（release）
 
+**推荐：一键脚本**（拉内核 → 带 dart-define 构建 → 出安装包，自动避开漏 `--dart-define` 的坑）：
+
+```powershell
+powershell -ExecutionPolicy Bypass -File client\windows\build.ps1 -ApiUrl http://<后端IP>:8080
+# 只构建不出安装包：加 -SkipInstaller
+```
+
+或手动分步：
+
 ```powershell
 cd client
-flutter build windows
+# 必须带 --dart-define 指定后端，否则默认连 localhost:8080，登录会「网络请求失败」
+flutter build windows --dart-define=PANGOLIN_API_URL=http://<后端IP>:8080
 ```
+> ⚠️ `kApiBaseUrl` 默认值是 `http://localhost:8080`（见 `lib/services/api_config.dart`）。
+> Release 包必须显式 `--dart-define=PANGOLIN_API_URL=...`，构建期烘进二进制；漏了会复现登录失败。
+
 CMake 的 install 步骤会自动把 `app/kernel/dist/desktop/windows-*/{sing-box.exe, wintun.dll}`
 拷到 app `.exe` 同级目录（见 `windows/CMakeLists.txt` 的「Pangolin sing-box kernel」段）。
 **wintun.dll 必须与 sing-box.exe 同目录**，否则 sing-box 无法创建 TUN。

client/windows/build.ps1

@@ -0,0 +1,97 @@
+<#
+.SYNOPSIS
+  Pangolin Windows 客户端一键构建脚本（拉内核 → 带 dart-define 构建 → 出安装包）。
+
+.DESCRIPTION
+  串起 client/windows/README.md 里的三步手动流程，避免漏掉 --dart-define
+  （漏了会默认连 localhost:8080，登录「网络请求失败」）。
+
+  步骤：
+    1. bash app/kernel/fetch-desktop-bin.sh windows <arch>   （拉 sing-box.exe + wintun.dll，SHA 校验）
+    2. flutter build windows --release --dart-define=PANGOLIN_API_URL=<ApiUrl>
+    3. ISCC.exe installer\pangolin.iss                         （除非 -SkipInstaller）
+
+.PARAMETER ApiUrl
+  必填。后端地址，会在构建期烘进二进制，例：http://103.119.13.48:8080
+
+.PARAMETER Arch
+  CPU 架构，默认 amd64。
+
+.PARAMETER SkipInstaller
+  只构建，不出 Inno Setup 安装包。
+
+.EXAMPLE
+  powershell -ExecutionPolicy Bypass -File client\windows\build.ps1 -ApiUrl http://103.119.13.48:8080
+#>
+[CmdletBinding()]
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$ApiUrl,
+
+    [string]$Arch = "amd64",
+
+    [switch]$SkipInstaller
+)
+
+$ErrorActionPreference = "Stop"
+
+# 路径解析：本脚本在 client/windows/ 下
+$WindowsDir = $PSScriptRoot
+$ClientDir  = Split-Path -Parent $WindowsDir
+$RepoRoot   = Split-Path -Parent $ClientDir
+
+function Step([string]$msg) { Write-Host "`n==> $msg" -ForegroundColor Cyan }
+
+# ── 1. 拉内核（sing-box.exe + wintun.dll）─────────────────────────────────────
+Step "拉取 sing-box.exe + wintun.dll (windows $Arch)"
+$bash = Get-Command bash -ErrorAction SilentlyContinue
+if (-not $bash) {
+    throw "未找到 bash（fetch 脚本需 Git Bash）。请安装 Git for Windows 后重试。"
+}
+$fetchScript = Join-Path $RepoRoot "app/kernel/fetch-desktop-bin.sh"
+& $bash.Source $fetchScript windows $Arch
+if ($LASTEXITCODE -ne 0) { throw "内核拉取失败 (exit $LASTEXITCODE)" }
+
+# ── 2. Flutter 构建（必须带 dart-define）──────────────────────────────────────
+Step "flutter build windows --release (PANGOLIN_API_URL=$ApiUrl)"
+Push-Location $ClientDir
+try {
+    flutter build windows --release --dart-define=PANGOLIN_API_URL=$ApiUrl
+    if ($LASTEXITCODE -ne 0) { throw "flutter build 失败 (exit $LASTEXITCODE)" }
+}
+finally {
+    Pop-Location
+}
+
+$releaseDir = Join-Path $ClientDir "build\windows\x64\runner\Release"
+Write-Host "构建产物：$releaseDir" -ForegroundColor Green
+
+# ── 3. 出安装包（Inno Setup）──────────────────────────────────────────────────
+if ($SkipInstaller) {
+    Step "跳过安装包（-SkipInstaller）"
+    return
+}
+
+Step "编译 Inno Setup 安装包"
+$iscc = $null
+foreach ($p in @(
+        "C:\Program Files (x86)\Inno Setup 6\ISCC.exe",
+        "C:\Program Files\Inno Setup 6\ISCC.exe")) {
+    if (Test-Path $p) { $iscc = $p; break }
+}
+if (-not $iscc) {
+    $cmd = Get-Command ISCC.exe -ErrorAction SilentlyContinue
+    if ($cmd) { $iscc = $cmd.Source }
+}
+if (-not $iscc) {
+    Write-Warning "未找到 ISCC.exe（Inno Setup 6 未安装）。已完成构建，跳过安装包。"
+    Write-Warning "装好 Inno Setup 6 后可手动：ISCC.exe `"$WindowsDir\installer\pangolin.iss`""
+    return
+}
+
+$iss = Join-Path $WindowsDir "installer\pangolin.iss"
+& $iscc $iss
+if ($LASTEXITCODE -ne 0) { throw "ISCC 编译失败 (exit $LASTEXITCODE)" }
+
+$output = Join-Path $WindowsDir "installer\Output"
+Write-Host "`n✓ 全部完成。安装包在：$output" -ForegroundColor Green

client/windows/flutter/generated_plugin_registrant.cc

@@ -7,8 +7,17 @@
 #include "generated_plugin_registrant.h"
 
 #include <flutter_secure_storage_windows/flutter_secure_storage_windows_plugin.h>
+#include <screen_retriever_windows/screen_retriever_windows_plugin_c_api.h>
+#include <tray_manager/tray_manager_plugin.h>
+#include <window_manager/window_manager_plugin.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
   FlutterSecureStorageWindowsPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FlutterSecureStorageWindowsPlugin"));
+  ScreenRetrieverWindowsPluginCApiRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("ScreenRetrieverWindowsPluginCApi"));
+  TrayManagerPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("TrayManagerPlugin"));
+  WindowManagerPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("WindowManagerPlugin"));
 }

client/windows/flutter/generated_plugins.cmake

@@ -4,6 +4,9 @@
 
 list(APPEND FLUTTER_PLUGIN_LIST
   flutter_secure_storage_windows
+  screen_retriever_windows
+  tray_manager
+  window_manager
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST