💥 feat(agent)!: 添加主机监控代理首版

* 实现周期采集、快照缓存、本地 HTTP API 和主动上报

* 补齐 Linux 和 Windows 主机、网络、资源、进程和 TCP 采集

* 添加服务生命周期管理、配置加载、构建脚本和测试覆盖

BREAKING CHANGE: network.ips 拆分为 network.ipv4s 和 network.ipv6s。

internal/collector/network_test.go

@@ -0,0 +1,23 @@
+package collector
+
+import (
+	"reflect"
+	"testing"
+)
+
+// TestNetworkAddressSetsSeparatesIPv4AndIPv6 verifies flattened IP lists are split by address family.
+func TestNetworkAddressSetsSeparatesIPv4AndIPv6(t *testing.T) {
+	ipv4s, ipv6s := networkAddressSets(map[string]struct{}{
+		"fe80::1/64":      {},
+		"192.168.1.10/24": {},
+		"10.0.0.2/8":      {},
+		"not-an-ip":       {},
+	})
+
+	if want := []string{"10.0.0.2/8", "192.168.1.10/24"}; !reflect.DeepEqual(ipv4s, want) {
+		t.Fatalf("ipv4s = %#v, want %#v", ipv4s, want)
+	}
+	if want := []string{"fe80::1/64"}; !reflect.DeepEqual(ipv6s, want) {
+		t.Fatalf("ipv6s = %#v, want %#v", ipv6s, want)
+	}
+}