refactor: 合并 avdetect 到 systeminfo，修复杀软检测误报

- 将 avdetect 的进程匹配逻辑合并到 systeminfo 插件
- 修复进程匹配使用 Contains 导致大量误报，改为精确匹配
- 修正 auto.json 中 Microsoft Security Essentials 为 Microsoft Defender
- 使用 map 索引优化进程匹配性能
- 清理废弃的 envinfo/avdetect i18n key

web/api/config.go

@@ -114,7 +114,6 @@ var plugins = []PluginInfo{
 	{Name: "poc", Type: "web", Description: "POC漏洞检测", DescEn: "POC vulnerability detection", Enabled: true},
 
 	// 本地类
-	{Name: "avdetect", Type: "local", Description: "杀软检测", DescEn: "Antivirus detection", Enabled: false},
 	{Name: "cleaner", Type: "local", Description: "痕迹清理", DescEn: "Trace cleaning", Enabled: false},
 }