feat(*): 创作与运维 - 新增图片尺寸预设和系统性能面板并优化图片组动画

backend/internal/service/system_metrics_linux.go

@@ -0,0 +1,43 @@
+//go:build linux
+
+package service
+
+import (
+	"os"
+	"strconv"
+	"strings"
+)
+
+func platformMemory() (uint64, uint64, bool) {
+	data, err := os.ReadFile("/proc/meminfo")
+	if err != nil {
+		return 0, 0, false
+	}
+	values := map[string]uint64{}
+	for _, line := range strings.Split(string(data), "\n") {
+		fields := strings.Fields(line)
+		if len(fields) < 2 {
+			continue
+		}
+		value, _ := strconv.ParseUint(fields[1], 10, 64)
+		values[strings.TrimSuffix(fields[0], ":")] = value * 1024
+	}
+	total, available := values["MemTotal"], values["MemAvailable"]
+	return total, available, total > 0
+}
+
+func platformLoadAverage() ([3]float64, bool) {
+	var result [3]float64
+	data, err := os.ReadFile("/proc/loadavg")
+	if err != nil {
+		return result, false
+	}
+	fields := strings.Fields(string(data))
+	if len(fields) < 3 {
+		return result, false
+	}
+	for index := range 3 {
+		result[index], _ = strconv.ParseFloat(fields[index], 64)
+	}
+	return result, true
+}