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>

cmd/edge-agent/main.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"log"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+
+	"tianyan-edge/internal/config"
+	"tianyan-edge/internal/control"
+	"tianyan-edge/internal/event"
+	"tianyan-edge/internal/infer"
+	"tianyan-edge/internal/stream"
+)
+
+func main() {
+	cfgPath := flag.String("config", "/opt/tianyan-edge/config/edge.yaml", "config file")
+	flag.Parse()
+
+	cfg := config.Load(*cfgPath)
+	log.Printf("edge-agent start id=%s cloud=%s", cfg.EdgeID, cfg.CloudURL)
+
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer cancel()
+
+	frames := make(chan stream.Frame, 50)
+	events := make(chan event.SuspectedEvent, 200)
+
+	var wg sync.WaitGroup
+	run := func(fn func(context.Context)) {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			fn(ctx)
+		}()
+	}
+
+	run(stream.NewIngestor(cfg, frames).Run)
+	run(infer.NewClient(cfg, frames, events).Run)
+	run(event.NewUploader(cfg, events).Run)
+	run(control.NewHeartbeat(cfg).Run)
+	run(control.NewConfigAgent(cfg).Run)
+	run(control.NewOTAAgent(cfg).Run)
+
+	wg.Wait()
+	log.Println("edge-agent stop")
+}