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/root.go

@@ -25,43 +25,39 @@ import (
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 
-	"github.com/spf13/viper"
+	"it2000.com.cn/tele-recv/config"
 	"it2000.com.cn/tele-recv/utils"
 )
 
 const ModeName = "TELEGRAM_MODE"
 
 var (
-	cfgFile  string
-	device   string
-	baudrate int
-	lograw   bool
-
-	dbFile string
-	dbInit bool
+	cfgFile string
 
+	// Legacy global vars for backward compatibility with test command
+	device        string
+	baudrate      int
+	dbFile        string
+	dbInit        bool
 	socketAddress string
+	pulsarUrl     string
+	topic         string
+	name          string
+	tcp           bool
+	pulsar        bool
+	lograw        bool
 
-	pulsarUrl string
-	topic     string
-	name      string
-
-	tcp    bool
-	pulsar bool
+	Mode string
 
 	// rootCmd represents the base command when called without any subcommands
 	rootCmd = &cobra.Command{
 		Use:   "tele-recv",
 		Short: "telegram receiver",
 		Long: `A serial port telegram receiver.
-Read the telegram from `,
-		// Uncomment the following line if your bare application
-		// has an action associated with it:
-		//	Run: func(cmd *cobra.Command, args []string) { },
+Read the telegram from serial port`,
 	}
 
-	Mode = os.Getenv(ModeName)
-
+	appCfg *config.Config
 	logger *zap.Logger
 )
 
@@ -77,55 +73,36 @@ func Execute() {
 func init() {
 	cobra.OnInitialize(initConfig)
 
-	// Here you will define your flags and configuration settings.
-	// Cobra supports persistent flags, which, if defined here,
-	// will be global for your application.
-
 	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (telegram.yaml)")
-	// Cobra also supports local flags, which will only run
-	// when this action is called directly.
 	rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
 
 	initLog()
-	defer logger.Sync()
-	// l = logger.Sugar()
 	utils.Log = logger
-
 }
 
 // initConfig reads in config file and ENV variables if set.
 func initConfig() {
-	if cfgFile != "" {
-		// Use config file from the flag.
-		viper.SetConfigFile(cfgFile)
-	} else {
-		// Search config in home directory with name ".tele-recv" (without extension).
-		viper.AddConfigPath(".")
-		viper.SetConfigName("telegram")
-	}
-
-	viper.AutomaticEnv() // read in environment variables that match
-
-	// If a config file is found, read it in.
-	if err := viper.ReadInConfig(); err == nil {
-		// fmt.Println("Using config file:", viper.ConfigFileUsed())
-		logger.Info("Using config file ", zap.String("path", viper.ConfigFileUsed()))
-		device = viper.GetString("serial.device")
-		baudrate = viper.GetInt("serial.baudrate")
-		lograw = viper.GetBool("serial.lograw")
-		dbFile = viper.GetString("sqlite.file")
-		dbInit = viper.GetBool("sqlite.init")
-		socketAddress = viper.GetString("socket.address")
-		pulsarUrl = viper.GetString("pulsar.url")
-		topic = viper.GetString("pulsar.topic")
-		name = viper.GetString("pulsar.name")
-
-		tcp = viper.GetBool("telegram.tcp")
-		utils.Tcp = tcp
-		pulsar = viper.GetBool("telegram.pulsar")
-		utils.Pulsar = pulsar
+	cfg, err := config.Load(cfgFile)
+	if err != nil {
+		logger.Warn("config load error, using defaults", zap.Error(err))
+		return
 	}
+	appCfg = cfg
 
+	// Populate legacy globals for backward compatibility
+	device = cfg.Serial.Device
+	baudrate = cfg.Serial.Baudrate
+	lograw = cfg.Serial.LogRaw
+	dbFile = cfg.SQLite.File
+	dbInit = cfg.SQLite.Init
+	socketAddress = cfg.Socket.Address
+	pulsarUrl = cfg.Pulsar.URL
+	topic = cfg.Pulsar.Topic
+	name = cfg.Pulsar.Name
+	tcp = cfg.Telegram.TCP
+	pulsar = cfg.Telegram.Pulsar
+	utils.Tcp = tcp
+	utils.Pulsar = pulsar
 }
 
 func initLog() {
@@ -163,5 +140,4 @@ func initLog() {
 	)
 
 	logger = zap.New(core)
-
 }