feat: add dynamic config reload, unique device identity (UUID), and MQTT support

- New StreamManager for dynamic RTSP/FLV stream lifecycle
- Dynamic worker scaling for inference
- Device UUID generation and persistence
- Telegraf config and NPU monitoring scripts
- .gitignore for build artifacts

scripts/npu_info.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+# 采集 NPU 状态并输出为 Influx Line Protocol
+
+COMMON_OUTPUT=$(/usr/local/sbin/npu-smi info -t common -i 0 2>/dev/null)
+MEM_OUTPUT=$(/usr/local/sbin/npu-smi info -t memory -i 0 2>/dev/null)
+
+TEMP=$(echo "$COMMON_OUTPUT" | grep "Temperature(C)" | awk '{print $NF}')
+UTIL=$(echo "$COMMON_OUTPUT" | grep "Aicore Usage Rate" | awk '{print $NF}')
+MEM_TOTAL_MB=$(echo "$MEM_OUTPUT" | grep "Capacity(MB)" | awk '{print $NF}')
+MEM_RATE=$(echo "$COMMON_OUTPUT" | grep "Memory Usage Rate" | awk '{print $NF}')
+
+# 计算实际使用量 (使用 awk 代替 bc)
+if [ -n "$MEM_TOTAL_MB" ] && [ -n "$MEM_RATE" ]; then
+    MEM_USED_MB=$(awk "BEGIN {printf \"%d\", $MEM_TOTAL_MB * $MEM_RATE / 100}")
+else
+    MEM_TOTAL_MB=0
+    MEM_USED_MB=0
+    UTIL=0
+    TEMP=0
+fi
+
+# 默认值保护
+TEMP=${TEMP:-0}
+UTIL=${UTIL:-0}
+
+echo "npu_status,device=0 temp=${TEMP},utilization=${UTIL},memory_used=${MEM_USED_MB:-0},memory_total=${MEM_TOTAL_MB:-0}"