fix: 修复6个边缘侧问题 + 单元测试

1. 删除 ConfigAgent (与 MQTT 配置更新重叠且未启用)
2. OTA 完整安装流程: 解压tar.gz -> 校验ELF -> 替换二进制 -> systemctl重启
3. StreamManager stopAll 添加 Wait() 防止僵尸进程
4. InferClient socket 读写添加 timeout 防止永久阻塞
5. Heartbeat 集成 NPU 监控 (npu-smi + fallback 脚本)
6. 配置更新时动态重启 ffmpeg 以应用新 fps

internal/control/heartbeat.go

@@ -7,6 +7,9 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"os/exec"
+	"strconv"
+	"strings"
 	"time"
 
 	"tianyan-edge/internal/config"
@@ -24,6 +27,10 @@ func (h *Heartbeat) Run(ctx context.Context) {
 	client := &http.Client{Timeout: 5 * time.Second}
 	ticker := time.NewTicker(30 * time.Second)
 	defer ticker.Stop()
+
+	// Send first heartbeat immediately
+	h.send(client)
+
 	for {
 		select {
 		case <-ctx.Done():
@@ -40,6 +47,12 @@ func (h *Heartbeat) send(client *http.Client) {
 		"version": h.cfg.Version,
 		"ts":      float64(time.Now().UnixMilli()) / 1000.0,
 	}
+
+	// Collect NPU stats if available
+	if npu := collectNPUStats(); npu != nil {
+		payload["npu"] = npu
+	}
+
 	body, _ := json.Marshal(payload)
 	url := fmt.Sprintf("%s/api/v1/edge/heartbeat", h.cfg.CloudURL)
 	req, _ := http.NewRequest(http.MethodPost, url, bytes.NewReader(body))
@@ -52,3 +65,113 @@ func (h *Heartbeat) send(client *http.Client) {
 	}
 	resp.Body.Close()
 }
+
+// NPUStats holds parsed NPU telemetry
+type NPUStats struct {
+	TempC      int `json:"temp_c"`
+	UtilPct    int `json:"util_pct"`
+	MemUsedMB  int `json:"mem_used_mb"`
+	MemTotalMB int `json:"mem_total_mb"`
+	MemPct     int `json:"mem_pct"`
+}
+
+// collectNPUStats runs npu-smi and parses the output
+func collectNPUStats() *NPUStats {
+	// Try npu-smi first (Ascend devices), fall back to the helper script
+	var commonOut, memOut []byte
+	var err error
+
+	commonOut, err = exec.Command("/usr/local/sbin/npu-smi", "info", "-t", "common", "-i", "0").CombinedOutput()
+	if err != nil {
+		// Fallback to shell script
+		commonOut, err = exec.Command("bash", "/opt/tianyan-edge/scripts/npu_info.sh").CombinedOutput()
+		if err != nil {
+			log.Printf("npu: monitoring unavailable: %v", err)
+			return nil
+		}
+		// If script succeeded, it outputs Influx line protocol — parse that
+		line := strings.TrimSpace(string(commonOut))
+		return parseInfluxLine(line)
+	}
+
+	memOut, _ = exec.Command("/usr/local/sbin/npu-smi", "info", "-t", "memory", "-i", "0").CombinedOutput()
+
+	return parseNpuSmiOutput(string(commonOut), string(memOut))
+}
+
+func parseNpuSmiOutput(common, memory string) *NPUStats {
+	stats := &NPUStats{}
+
+	for _, line := range strings.Split(common, "\n") {
+		line = strings.TrimSpace(line)
+		if strings.Contains(line, "Temperature") {
+			if v := extractLastNumber(line); v != 0 {
+				stats.TempC = v
+			}
+		}
+		if strings.Contains(line, "Aicore Usage Rate") {
+			if v := extractLastNumber(line); v != 0 {
+				stats.UtilPct = v
+			}
+		}
+		if strings.Contains(line, "Memory Usage Rate") {
+			if v := extractLastNumber(line); v != 0 {
+				stats.MemPct = v
+			}
+		}
+	}
+
+	for _, line := range strings.Split(memory, "\n") {
+		line = strings.TrimSpace(line)
+		if strings.Contains(line, "Capacity") {
+			if v := extractLastNumber(line); v != 0 {
+				stats.MemTotalMB = v
+			}
+		}
+	}
+
+	if stats.MemTotalMB > 0 && stats.MemPct > 0 {
+		stats.MemUsedMB = stats.MemTotalMB * stats.MemPct / 100
+	}
+
+	return stats
+}
+
+func parseInfluxLine(line string) *NPUStats {
+	// Format: npu_status,device=0 temp=X,utilization=Y,memory_used=Z,memory_total=W
+	stats := &NPUStats{}
+	parts := strings.Split(line, " ")
+	if len(parts) < 2 {
+		return nil
+	}
+	for _, field := range strings.Split(parts[1], ",") {
+		kv := strings.SplitN(field, "=", 2)
+		if len(kv) != 2 {
+			continue
+		}
+		v, _ := strconv.Atoi(kv[1])
+		switch kv[0] {
+		case "temp":
+			stats.TempC = v
+		case "utilization":
+			stats.UtilPct = v
+		case "memory_used":
+			stats.MemUsedMB = v
+		case "memory_total":
+			stats.MemTotalMB = v
+		}
+	}
+	return stats
+}
+
+func extractLastNumber(line string) int {
+	fields := strings.Fields(line)
+	if len(fields) == 0 {
+		return 0
+	}
+	// Last field might have units like "%" or "C"
+	raw := fields[len(fields)-1]
+	raw = strings.TrimRight(raw, "%C ")
+	v, _ := strconv.Atoi(raw)
+	return v
+}