init: tianyan-edge edge agent with Ascend NPU inference backend

- Go main process: stream ingestor, infer client, event uploader,
  heartbeat, config agent, OTA agent
- Python inference server rewritten to use CANN ACL (acl module)
  replacing ultralytics/PyTorch; supports YOLOv8 raw and YOLOv10
  NMS-free output formats via OUTPUT_FORMAT env var
- systemd services for edge-agent and edge-infer
- build/install/package scripts targeting arm64

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

systemd/edge-infer.service

@@ -0,0 +1,20 @@
+[Unit]
+Description=Tianyan Edge Inference Server (Ascend NPU)
+After=network.target
+
+[Service]
+Type=simple
+Environment=INFER_SOCKET=/tmp/edge-infer.sock
+Environment=OM_MODEL=/opt/tianyan-edge/model/model.om
+Environment=CONF_THRESHOLD=0.5
+Environment=IOU_THRESHOLD=0.45
+Environment=DEVICE_ID=0
+Environment=NAMES_FILE=/opt/tianyan-edge/model/names.txt
+# raw: YOLOv8 output [1,4+nc,anchors]  nms_free: YOLOv10 output [1,topk,6]
+Environment=OUTPUT_FORMAT=raw
+ExecStart=/usr/bin/python3 /opt/tianyan-edge/python/infer_server.py
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target