docs(agent): 统一中文注释并补充部署文档

将代码与测试注释改为中文以符合仓库规范；新增中文部署指南、
示例配置，并完善构建脚本对 VERSION 注入的说明。

Co-authored-by: Cursor <cursoragent@cursor.com>

configs/example.json

@@ -0,0 +1,21 @@
+{
+  "host_id": "host-example",
+  "http": {
+    "listen_address": "127.0.0.1:8080"
+  },
+  "collect": {
+    "interval": "30s",
+    "timeout": "10s"
+  },
+  "report": {
+    "enabled": false,
+    "endpoint": "http://center.example.internal/agent/status",
+    "interval": "60s",
+    "timeout": "5s"
+  },
+  "service": {
+    "name": "mfd-monitor-agent",
+    "display_name": "MFD Monitor Agent",
+    "description": "采集主机状态并通过 HTTP 提供查询"
+  }
+}