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/package-usb.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+DIST_DIR="$ROOT_DIR/dist"
+PKG_NAME="tianyan-edge-$(date +%Y%m%d-%H%M%S)"
+PKG_DIR="$DIST_DIR/$PKG_NAME"
+
+mkdir -p "$PKG_DIR"
+cp -r "$ROOT_DIR/build" "$PKG_DIR/"
+cp -r "$ROOT_DIR/python" "$PKG_DIR/"
+cp -r "$ROOT_DIR/systemd" "$PKG_DIR/"
+cp -r "$ROOT_DIR/config" "$PKG_DIR/"
+cp -r "$ROOT_DIR/scripts/install.sh" "$ROOT_DIR/scripts/uninstall.sh" "$PKG_DIR/"
+
+cd "$DIST_DIR"
+tar -czf "$PKG_NAME.tar.gz" "$PKG_NAME"
+
+echo "usb package ready: $DIST_DIR/$PKG_NAME.tar.gz"