[优化] 添加 Relay frps 连接和代理计数字段，重构相关逻辑以支持监控和可观测性

openflared/Dockerfile

@@ -1,5 +1,9 @@
+ARG VERSION=dev
+
 FROM golang:1.25-alpine AS builder
 
+ARG VERSION
+
 WORKDIR /build
 
 COPY openflared/go.mod openflared/go.sum ./
@@ -8,7 +12,7 @@ RUN go mod download
 
 COPY openflare_server/ ../openflare_server/
 COPY openflared/ .
-RUN CGO_ENABLED=0 GOOS=linux go build -o flared ./cmd/flared
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags "-s -w -X 'openflare-flared/internal/config.Version=$VERSION'" -o flared ./cmd/flared
 
 # Final runtime image
 FROM fatedier/frpc:v0.69.0

openflared/internal/config/version.go

@@ -0,0 +1,3 @@
+package config
+
+var Version = "dev"

openflared/internal/heartbeat/service.go

@@ -46,7 +46,7 @@ func (s *Service) doHeartbeat(ctx context.Context) {
 	slog.Debug("sending flared heartbeat")
 
 	payload := service.FlaredHeartbeatPayload{
-		ClientVersion:   "0.1.0", // TODO dynamically inject build version
+		ClientVersion:   config.Version,
 		FrpVersion:      s.frpcManager.GetVersion(),
 		TunnelStatus:    "running", // TODO implement proper status tracking
 		ConnectedRelays: s.frpcManager.GetConnectedRelays(),