feat: 添加窗口标题并优化Windows应用配置

- 在`windowconfiguration.dart`中添加窗口标题"Astral"并确保窗口管理器初始化
- 在`runner.exe.manifest`中添加UTF-8编码、长路径支持和SegmentHeap堆类型配置
- 在`Runner.rc`中更新应用描述、内部名称、原始文件名和产品名称为"Astral"
- 在`main.cpp`中实现单实例应用逻辑并更新窗口标题为"Astral"

lib/config/windowconfiguration.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:window_manager/window_manager.dart';
 
 Future<void> setupWindow() async {
+  await windowManager.ensureInitialized();
   WindowOptions windowOptions = const WindowOptions(
     size: Size(850, 520),
     minimumSize: Size(300, 300),
@@ -9,6 +10,7 @@ Future<void> setupWindow() async {
     backgroundColor: Colors.transparent,
     skipTaskbar: false,
     titleBarStyle: TitleBarStyle.hidden, // 隐藏标题栏
+    title: "Astral", // 添加窗口标题
   );
 
   await windowManager.waitUntilReadyToShow(windowOptions, () async {

windows/runner/Runner.rc

@@ -90,12 +90,12 @@ BEGIN
         BLOCK "040904e4"
         BEGIN
             VALUE "CompanyName", "com.example" "\0"
-            VALUE "FileDescription", "fltier" "\0"
+            VALUE "FileDescription", "Astral" "\0"
             VALUE "FileVersion", VERSION_AS_STRING "\0"
-            VALUE "InternalName", "fltier" "\0"
+            VALUE "InternalName", "Astral" "\0"
             VALUE "LegalCopyright", "Copyright (C) 2025 com.example. All rights reserved." "\0"
-            VALUE "OriginalFilename", "fltier.exe" "\0"
-            VALUE "ProductName", "fltier" "\0"
+            VALUE "OriginalFilename", "Astral.exe" "\0"
+            VALUE "ProductName", "Astral" "\0"
             VALUE "ProductVersion", VERSION_AS_STRING "\0"
         END
     END

windows/runner/main.cpp

@@ -1,12 +1,42 @@
-#include <flutter/dart_project.h>
+#include <flutter/dart_project.h>
 #include <flutter/flutter_view_controller.h>
 #include <windows.h>
 
+#include <string>
+
 #include "flutter_window.h"
 #include "utils.h"
 
+BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam) {
+  const int bufferSize = 256;
+  wchar_t windowTitle[bufferSize];
+  
+  if (GetWindowTextW(hwnd, windowTitle, bufferSize)) {
+    if (_wcsicmp(windowTitle, L"Astral") == 0) {
+      *((HWND*)lParam) = hwnd;
+      return FALSE; 
+    }
+  }
+  return TRUE; 
+}
+
 int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
                       _In_ wchar_t *command_line, _In_ int show_command) {
+  HANDLE hMutex = CreateMutexW(NULL, TRUE, L"AstralAppSingleInstanceMutex");
+  if (GetLastError() == ERROR_ALREADY_EXISTS) {
+    HWND hWnd = NULL;
+    EnumWindows(EnumWindowsProc, (LPARAM)&hWnd);
+    
+    if (hWnd != NULL) {
+      if (IsIconic(hWnd)) {
+        ShowWindow(hWnd, SW_RESTORE);
+      }
+      SetForegroundWindow(hWnd);
+    }
+    CloseHandle(hMutex);
+    return 0;
+  }
+
   // Attach to console when present (e.g., 'flutter run') or create a
   // new console when running with a debugger.
   if (!::AttachConsole(ATTACH_PARENT_PROCESS) && ::IsDebuggerPresent()) {
@@ -27,7 +57,7 @@ int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
   FlutterWindow window(project);
   Win32Window::Point origin(10, 10);
   Win32Window::Size size(1280, 720);
-  if (!window.Create(L"fltier", origin, size)) {
+  if (!window.Create(L"Astral", origin, size)) {
     return EXIT_FAILURE;
   }
   window.SetQuitOnClose(true);
@@ -38,6 +68,6 @@ int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
     ::DispatchMessage(&msg);
   }
 
-  ::CoUninitialize();
+  CloseHandle(hMutex);
   return EXIT_SUCCESS;
 }

windows/runner/runner.exe.manifest

@@ -4,6 +4,9 @@
   <application xmlns="urn:schemas-microsoft-com:asm.v3">
     <windowsSettings>
       <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+      <activeCodePage xmlns="http://schemas.microsoft.com/SMI/2019/WindowsSettings">UTF-8</activeCodePage>
+      <longPathAware xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">true</longPathAware>
+      <heapType xmlns="http://schemas.microsoft.com/SMI/2020/WindowsSettings">SegmentHeap</heapType>
     </windowsSettings>
   </application>
   <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">