fix: comprehensive bug fixes and architecture restructuring

Phase 1 — Bug fixes (7 bugs):
- Bug 1: Pulsar mode data loss — always persist to SQLite regardless of mode
- Bug 2: PulsarSend closing TCP client — use independent resetPulsarProducer()
- Bug 3: Greedy regex — use non-greedy (?s)ZCZC.*?NNNN
- Bug 4: Data after NNNN discarded — keep remaining buffer data
- Bug 5: strings.Index > 0 boundary — use strings.Contains
- Bug 6: Variable shadowing in PulsarSend — use = not :=
- Bug 7: Accept failure nil panic — add continue + retry logic

Phase 2 — Architecture restructuring:
- Split utils/ into config/, serial/, telegram/, storage/, transport/
- Define Sender, Repository, Reader interfaces
- Introduce app/ layer with context.Context lifecycle
- Replace spinlock with sync.Mutex
- Unified Config struct replaces 15+ global vars

Phase 3 — Testing & tooling:
- telegram/parser_test.go (7 test cases)
- storage/store_test.go (5 test cases)
- transport/transport_test.go (4 test cases)
- Taskfile: add test, test-race, test-cover tasks
- Go version: 1.15 -> 1.21

cmd/start.go

@@ -16,15 +16,10 @@ limitations under the License.
 package cmd
 
 import (
-	"fmt"
-	"os"
-	"os/signal"
-	"syscall"
-
-	"go.uber.org/zap"
-	"it2000.com.cn/tele-recv/utils"
-
 	"github.com/spf13/cobra"
+	"go.uber.org/zap"
+
+	"it2000.com.cn/tele-recv/app"
 )
 
 // startCmd represents the start command
@@ -33,85 +28,24 @@ var startCmd = &cobra.Command{
 	Short: "start telegram receive service",
 	Long: `open serial port
 	start a tcp server for processing`,
-	Run: func(cmd *cobra.Command, args []string) {
-		start()
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return start()
 	},
 }
 
 func init() {
 	rootCmd.AddCommand(startCmd)
-
-	// Here you will define your flags and configuration settings.
-
-	// Cobra supports Persistent Flags which will work for this command
-	// and all subcommands, e.g.:
-	// startCmd.PersistentFlags().String("foo", "", "A help for foo")
-
-	// Cobra supports local flags which will only run when this command
-	// is called directly, e.g.:
-	// startCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
 }
 
-func start() {
-	// Go signal notification works by sending `os.Signal`
-	// values on a channel. We'll create a channel to
-	// receive these notifications (we'll also make one to
-	// notify us when the program can exit).
-	sigs := make(chan os.Signal, 1)
-	done := make(chan bool, 1)
-
-	// `signal.Notify` registers the given channel to
-	// receive notifications of the specified signals.
-	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
-	utils.ServerRunning = true
-
-	// This goroutine executes a blocking receive for
-	// signals. When it gets one it'll print it out
-	// and then notify the program that it can finish.
-	go func() {
-		sig := <-sigs
-		logger.Info("got ", zap.Any("signal", sig))
-		utils.ServerRunning = false
-		if tcp {
-			utils.StopSocketServer()
-		}
-		if pulsar {
-			utils.ClosePulsar()
-		}
-		done <- true
-	}()
-
-	// The program will wait here until it gets the
-	// expected signal (as indicated by the goroutine
-	// above sending a value on `done`) and then exit.
-	logger.Info("awaiting signal")
-	_ = utils.InitDb(dbFile, dbInit)
-	if tcp {
-		go utils.Listen(socketAddress)
+func start() error {
+	if appCfg == nil {
+		logger.Fatal("configuration not loaded")
 	}
-	if pulsar {
-		utils.CreateProducer(pulsarUrl, topic, name)
-	}
-	for utils.ServerRunning {
-		if !utils.IsPortOpen() {
-			logger.Info("try to open port")
-			err := utils.OpenPort(device, baudrate)
-			if err != nil {
-				logger.Fatal("error in open serial port ", zap.Error(err))
-			}
-			logger.Info("starting read")
-		}
-		buffer, err := utils.ReadPort()
-		if err == nil {
-			if lograw && len(buffer) > 0 {
-				fmt.Println(buffer)
-			}
-			if utils.Append(buffer) {
-				fmt.Println()
-			}
-		}
-	}
-	<-done
-	logger.Info("exiting")
 
+	a, err := app.New(appCfg)
+	if err != nil {
+		logger.Fatal("failed to create app", zap.Error(err))
+	}
+
+	return a.Run()
 }