feat: 添加跨平台编译脚本和构建文档

- 添加Windows和Linux/macOS编译脚本
- 支持多架构编译(amd64/arm64)
- 生成各平台可执行文件到dist目录
- 添加构建使用说明文档

BUILD_README.md

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+# System Toast - 跨平台系统通知应用
+
+这是一个简单的跨平台系统通知应用，支持Windows、macOS和Linux系统。
+
+## 编译输出
+
+应用已编译为以下平台和架构：
+
+### Windows
+- `dist/windows/system-toast-windows-amd64.exe` - Windows 64位 (AMD64)
+- `dist/windows/system-toast-windows-arm64.exe` - Windows 64位 (ARM64)
+
+### macOS
+- `dist/macos/system-toast-macos-amd64` - macOS Intel 64位
+- `dist/macos/system-toast-macos-arm64` - macOS Apple Silicon (M1/M2)
+
+### Linux
+- `dist/linux/system-toast-linux-amd64` - Linux 64位 (AMD64)
+- `dist/linux/system-toast-linux-arm64` - Linux 64位 (ARM64)
+
+## 使用方法
+
+### Windows
+```cmd
+system-toast-windows-amd64.exe -message "你的消息内容" -title "通知标题"
+```
+
+### macOS
+```bash
+./system-toast-macos-amd64 -message "你的消息内容" -title "通知标题"
+```
+
+### Linux
+```bash
+./system-toast-linux-amd64 -message "你的消息内容" -title "通知标题"
+```
+
+## 参数说明
+
+- `-message` (必需): 通知消息内容
+- `-title` (可选): 通知标题，默认为"提醒"
+
+## 示例
+
+```bash
+# Windows
+system-toast-windows-amd64.exe -message "任务已完成" -title "系统通知"
+
+# macOS
+./system-toast-macos-amd64 -message "任务已完成" -title "系统通知"
+
+# Linux
+./system-toast-linux-amd64 -message "任务已完成" -title "系统通知"
+```
+
+## 重新编译
+
+如需重新编译，可以运行以下脚本：
+
+- Windows: `build.bat`
+- Linux/macOS: `build.sh`
+
+## 注意事项
+
+- 在Linux系统上需要安装`libnotify-bin`包才能使用通知功能
+- macOS系统会自动使用内置的通知系统
+- Windows系统使用PowerShell的Toast通知功能

build.bat

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+@echo off
+chcp 65001 >nul
+echo Building system notification application...
+
+:: Set Go path
+set GO_EXE="C:\Program Files\Go\bin\go.exe"
+
+:: Create output directories
+if not exist "dist" mkdir dist
+if not exist "dist\windows" mkdir dist\windows
+if not exist "dist\macos" mkdir dist\macos
+if not exist "dist\linux" mkdir dist\linux
+
+:: Windows AMD64
+echo Building Windows AMD64...
+set GOOS=windows
+set GOARCH=amd64
+%GO_EXE% build -o dist/windows/system-toast-windows-amd64.exe main.go
+
+:: Windows ARM64
+echo Building Windows ARM64...
+set GOOS=windows
+set GOARCH=arm64
+%GO_EXE% build -o dist/windows/system-toast-windows-arm64.exe main.go
+
+:: macOS AMD64
+echo Building macOS AMD64...
+set GOOS=darwin
+set GOARCH=amd64
+%GO_EXE% build -o dist/macos/system-toast-macos-amd64 main.go
+
+:: macOS ARM64 (Apple Silicon)
+echo Building macOS ARM64...
+set GOOS=darwin
+set GOARCH=arm64
+%GO_EXE% build -o dist/macos/system-toast-macos-arm64 main.go
+
+:: Linux AMD64
+echo Building Linux AMD64...
+set GOOS=linux
+set GOARCH=amd64
+%GO_EXE% build -o dist/linux/system-toast-linux-amd64 main.go
+
+:: Linux ARM64
+echo Building Linux ARM64...
+set GOOS=linux
+set GOARCH=arm64
+%GO_EXE% build -o dist/linux/system-toast-linux-arm64 main.go
+
+echo Build completed!
+echo Output directory: dist\
+pause

build.sh

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+#!/bin/bash
+
+echo "正在编译系统通知应用..."
+
+# 创建输出目录
+mkdir -p dist/{windows,macos,linux}
+
+# Windows AMD64
+echo "编译 Windows AMD64..."
+GOOS=windows GOARCH=amd64 go build -o dist/windows/system-toast-windows-amd64.exe main.go
+
+# Windows ARM64
+echo "编译 Windows ARM64..."
+GOOS=windows GOARCH=arm64 go build -o dist/windows/system-toast-windows-arm64.exe main.go
+
+# macOS AMD64
+echo "编译 macOS AMD64..."
+GOOS=darwin GOARCH=amd64 go build -o dist/macos/system-toast-macos-amd64 main.go
+
+# macOS ARM64 (Apple Silicon)
+echo "编译 macOS ARM64..."
+GOOS=darwin GOARCH=arm64 go build -o dist/macos/system-toast-macos-arm64 main.go
+
+# Linux AMD64
+echo "编译 Linux AMD64..."
+GOOS=linux GOARCH=amd64 go build -o dist/linux/system-toast-linux-amd64 main.go
+
+# Linux ARM64
+echo "编译 Linux ARM64..."
+GOOS=linux GOARCH=arm64 go build -o dist/linux/system-toast-linux-arm64 main.go
+
+echo "编译完成！"
+echo "输出目录: dist/"