Fix: 解决Win10中文乱码和编译路径问题

- 将批处理脚本改为英文输出
- 添加UTF-8编码支持(chcp 65001)
- 添加go.mod存在性检查
- 创建详细的Windows使用说明文档

build.bat

@@ -1,29 +1,41 @@
 @echo off
+chcp 65001 >nul 2>&1
 echo ========================================
-echo 网络拓扑发现系统 - 编译脚本
+echo Network Topology Discovery System - Build Script
 echo ========================================
 echo.
 
-echo [1/3] 清理旧文件...
+REM Check if go.mod exists
+if not exist go.mod (
+    echo Error: go.mod not found!
+    echo Please run this script from the project root directory.
+    echo.
+    echo Current directory: %CD%
+    echo.
+    pause
+    exit /b 1
+)
+
+echo [1/3] Cleaning old files...
 if exist network-topology.exe del network-topology.exe
 
 echo.
-echo [2/3] 编译程序...
+echo [2/3] Building program...
 set GOOS=windows
 set GOARCH=amd64
 go build -o network-topology.exe -ldflags="-s -w" ./cmd
 
 if %ERRORLEVEL% NEQ 0 (
     echo.
-    echo 编译失败!
+    echo Build failed!
     pause
     exit /b 1
 )
 
 echo.
-echo [3/3] 创建配置文件示例...
+echo [3/3] Creating config file example...
 if not exist config.json (
-    echo 创建默认配置文件...
+    echo Creating default config file...
     echo {> config.json
     echo   "scan_ranges": ["192.168.1.0/24"],>> config.json
     echo   "devices": [],>> config.json
@@ -45,13 +57,13 @@ if not exist config.json (
 
 echo.
 echo ========================================
-echo 编译完成!
+echo Build Complete!
 echo ========================================
 echo.
-echo 运行方式:
-echo   network-topology.exe                  (使用默认配置)
-echo   network-topology.exe config.json      (使用指定配置文件)
+echo Usage:
+echo   network-topology.exe                  (Use default config)
+echo   network-topology.exe config.json      (Use specified config)
 echo.
-echo 访问地址: http://localhost:8080
+echo Web UI: http://localhost:8080
 echo.
 pause