feat: 添加打包脚本和应用程序图标

- 新增 package-scripts 目录，包含 Inno Setup 安装包打包脚本
- 在 Avalonia-PC.csproj 中配置应用程序图标
- 更新 .gitignore 忽略打包输出目录和工具目录

package-scripts/installer/Avalonia-PC.iss

@@ -0,0 +1,59 @@
+#ifndef AppName
+#define AppName "Avalonia-PC"
+#endif
+#ifndef AppVersion
+#define AppVersion "1.0.0"
+#endif
+#ifndef AppPublisher
+#define AppPublisher "QiCheng"
+#endif
+#ifndef AppExeName
+#define AppExeName "Avalonia-PC.exe"
+#endif
+#ifndef SourceDir
+#define SourceDir "..\..\package-output\publish\Avalonia-PC\win-x64"
+#endif
+#ifndef OutputDir
+#define OutputDir "..\..\package-output\installer"
+#endif
+#ifndef RepoRoot
+#define RepoRoot "..\.."
+#endif
+#ifndef ChineseLanguageFile
+#define ChineseLanguageFile "compiler:Default.isl"
+#endif
+
+[Setup]
+AppId={{7E41DD4C-FBF3-4C65-8D9F-4F2D794BC284}
+AppName={#AppName}
+AppVersion={#AppVersion}
+AppPublisher={#AppPublisher}
+DefaultDirName={autopf}\{#AppName}
+DefaultGroupName={#AppName}
+OutputDir={#OutputDir}
+OutputBaseFilename={#AppName}-Setup-{#AppVersion}-win-x64
+SetupIconFile={#RepoRoot}\Avalonia-PC\Assets\avalonia-logo.ico
+Compression=lzma2
+SolidCompression=yes
+WizardStyle=modern
+PrivilegesRequired=admin
+ArchitecturesAllowed=x64compatible
+ArchitecturesInstallIn64BitMode=x64compatible
+DisableProgramGroupPage=yes
+UninstallDisplayIcon={app}\{#AppExeName}
+
+[Languages]
+Name: "chinesesimp"; MessagesFile: "{#ChineseLanguageFile}"
+
+[Tasks]
+Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked
+
+[Files]
+Source: "{#SourceDir}\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
+
+[Icons]
+Name: "{group}\{#AppName}"; Filename: "{app}\{#AppExeName}"
+Name: "{autodesktop}\{#AppName}"; Filename: "{app}\{#AppExeName}"; Tasks: desktopicon
+
+[Run]
+Filename: "{app}\{#AppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(AppName, '&', '&&')}}"; Flags: nowait postinstall skipifsilent