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>

scripts/uninstall.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+sudo systemctl stop edge-agent.service edge-infer.service || true
+sudo systemctl disable edge-agent.service edge-infer.service || true
+sudo rm -f /etc/systemd/system/edge-agent.service /etc/systemd/system/edge-infer.service
+sudo systemctl daemon-reload
+sudo rm -rf /opt/tianyan-edge
+
+echo "uninstalled /opt/tianyan-edge"