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>

internal/config/config.go

@@ -0,0 +1,45 @@
+package config
+
+import (
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	EdgeID          string   `yaml:"edge_id"`
+	CloudURL        string   `yaml:"cloud_url"`
+	EdgeToken       string   `yaml:"edge_token"`
+	RTSPURLs        []string `yaml:"rtsp_urls"`
+	InferSocket     string   `yaml:"infer_socket"`
+	InferFPS        int      `yaml:"infer_fps"`
+	InferWorkers    int      `yaml:"infer_workers"`
+	ConfThreshold   float64  `yaml:"conf_threshold"`
+	DedupWindowSec  int      `yaml:"dedup_window_sec"`
+	Version         string   `yaml:"version"`
+}
+
+func Load(path string) *Config {
+	cfg := &Config{
+		EdgeID:         "edge-demo-001",
+		CloudURL:       "http://localhost:8004",
+		InferSocket:    "/tmp/edge-infer.sock",
+		InferFPS:       5,
+		InferWorkers:   2,
+		ConfThreshold:  0.5,
+		DedupWindowSec: 30,
+		Version:        "1.0.0",
+	}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return cfg
+	}
+	_ = yaml.Unmarshal(data, cfg)
+	if cfg.InferWorkers <= 0 {
+		cfg.InferWorkers = 1
+	}
+	if cfg.DedupWindowSec <= 0 {
+		cfg.DedupWindowSec = 30
+	}
+	return cfg
+}