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-agent.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Tianyan Edge Agent
+After=network-online.target edge-infer.service
+Wants=network-online.target
+
+[Service]
+Type=simple
+ExecStart=/opt/tianyan-edge/bin/edge-agent -config /opt/tianyan-edge/config/edge.yaml
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target