feat(ui): home dashboard ala mirador — jam blok, panel judul-di-border, metrik docker+host, navigasi 0/1

internal/sysinfo/sysinfo.go

@@ -0,0 +1,61 @@
+// Package sysinfo — metrik host ringan untuk dashboard (F-027).
+// Linux: baca /proc. OS lain: nilai nol (degrade anggun, tidak pernah panic).
+package sysinfo
+
+import (
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Stats struct {
+	MemTotal uint64  // KB
+	MemAvail uint64  // KB
+	Load1    float64 // load average 1 menit
+	Uptime   float64 // detik
+}
+
+func Read() Stats {
+	var s Stats
+	if b, err := os.ReadFile("/proc/meminfo"); err == nil {
+		parseMeminfo(string(b), &s)
+	}
+	if b, err := os.ReadFile("/proc/loadavg"); err == nil {
+		parseLoadavg(string(b), &s)
+	}
+	if b, err := os.ReadFile("/proc/uptime"); err == nil {
+		parseUptime(string(b), &s)
+	}
+	return s
+}
+
+func parseMeminfo(s string, st *Stats) {
+	for _, ln := range strings.Split(s, "\n") {
+		f := strings.Fields(ln)
+		if len(f) < 2 {
+			continue
+		}
+		v, err := strconv.ParseUint(f[1], 10, 64)
+		if err != nil {
+			continue
+		}
+		switch f[0] {
+		case "MemTotal:":
+			st.MemTotal = v
+		case "MemAvailable:":
+			st.MemAvail = v
+		}
+	}
+}
+
+func parseLoadavg(s string, st *Stats) {
+	if f := strings.Fields(s); len(f) > 0 {
+		st.Load1, _ = strconv.ParseFloat(f[0], 64)
+	}
+}
+
+func parseUptime(s string, st *Stats) {
+	if f := strings.Fields(s); len(f) > 0 {
+		st.Uptime, _ = strconv.ParseFloat(f[0], 64)
+	}
+}