💥 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/collector_other.go

@@ -0,0 +1,75 @@
+//go:build !linux && !windows
+
+package collector
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+	"runtime"
+	"strings"
+
+	"mfd-monitor-agent/internal/status"
+)
+
+// collectSystem fills portable host identity fields for non-Linux platforms.
+func collectSystem(_ context.Context, hostID string, out *status.HostStatus) error {
+	hostname, err := os.Hostname()
+	if err != nil {
+		return err
+	}
+	out.Host.HostID = hostID
+	if out.Host.HostID == "" {
+		out.Host.HostID = hostname
+	}
+	out.Host.Hostname = hostname
+	out.Host.Platform = runtime.GOOS
+	out.Host.Arch = runtime.GOARCH
+	return nil
+}
+
+// collectNetwork fills interface, address, and MAC data using the portable net package.
+func collectNetwork(_ context.Context, out *status.HostStatus) error {
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return err
+	}
+	seenIPs := map[string]struct{}{}
+	seenMACs := map[string]struct{}{}
+	for _, iface := range ifaces {
+		item := status.NetworkInterface{Name: iface.Name, MAC: iface.HardwareAddr.String(), MTU: iface.MTU, Flags: strings.Fields(iface.Flags.String())}
+		addrs, _ := iface.Addrs()
+		for _, addr := range addrs {
+			item.Addresses = append(item.Addresses, addr.String())
+			seenIPs[addr.String()] = struct{}{}
+		}
+		if item.MAC != "" {
+			seenMACs[item.MAC] = struct{}{}
+		}
+		out.Network.Interfaces = append(out.Network.Interfaces, item)
+	}
+	out.Network.IPv4s, out.Network.IPv6s = networkAddressSets(seenIPs)
+	for mac := range seenMACs {
+		out.Network.MACs = append(out.Network.MACs, mac)
+	}
+	return nil
+}
+
+// collectResource fills portable resource fields available without platform-specific APIs.
+func collectResource(_ context.Context, out *status.HostStatus) error {
+	out.CPU.LogicalCores = runtime.NumCPU()
+	return nil
+}
+
+// collectProcesses reports partial process collection until platform-specific support is added.
+func collectProcesses(_ context.Context, out *status.HostStatus) error {
+	out.Processes.Status = "partial"
+	return fmt.Errorf("process collection is not implemented for %s without platform-specific support", runtime.GOOS)
+}
+
+// collectSockets reports partial TCP listener collection until platform-specific support is added.
+func collectSockets(_ context.Context, out *status.HostStatus) error {
+	out.TCPListeners.Status = "partial"
+	return fmt.Errorf("tcp listener process mapping is not implemented for %s without platform-specific support", runtime.GOOS)
+}