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

utils/pulsar.go

@@ -39,26 +39,37 @@ func create() {
 	}
 }
 
+func resetPulsarProducer() {
+	if producer != nil {
+		producer.Close()
+	}
+	if pulsarClient != nil {
+		pulsarClient.Close()
+	}
+	create()
+}
+
 func PulsarSend(data string) error {
 	var err error
+	var id pulsar.MessageID
 	for i := 0; i < 5; i++ {
-		id, err := producer.Send(context.Background(), &pulsar.ProducerMessage{
+		id, err = producer.Send(context.Background(), &pulsar.ProducerMessage{
 			Payload: []byte(data),
 		})
 		if err == nil {
-			Log.Info("send to pulsar", zap.Any("id", id))
+			Log.Info("send ", zap.Any("id", id))
 			break
 		}
-		Log.Error("error in produce message", zap.Error(err))
-		closeClient()
-		create()
+		resetPulsarProducer()
 	}
 	return err
 }
 
 func ClosePulsar() {
-	producer.Close()
-	if client != nil {
-		client.Close()
+	if producer != nil {
+		producer.Close()
 	}
-}
+	if pulsarClient != nil {
+		pulsarClient.Close()
+	}
+}