✨ Upgrade Go version to 1.23.0 and update dependencies. Introduce new application structure with Clean Architecture principles, including message processing, NATS integration, and PostgreSQL repository. Add configuration management using Koanf and structured logging with Zap. Remove legacy GraphQL integration and related files. Implement dependency injection with Google Wire.

internal/infra/nats/publisher.go

@@ -0,0 +1,57 @@
+package nats
+
+import (
+	"caatsm/internal/adapter"
+	"caatsm/internal/infra/config"
+	"encoding/json"
+	"fmt"
+	"go.uber.org/zap"
+	"github.com/nats-io/nats.go"
+)
+
+// Publisher publishes messages to NATS JetStream
+type Publisher struct {
+	js     nats.JetStreamContext
+	cfg    *config.Config
+	logger *zap.Logger
+}
+
+// ProvidePublisher creates a NATS publisher
+func ProvidePublisher(
+	js nats.JetStreamContext,
+	cfg *config.Config,
+	logger *zap.Logger,
+) (adapter.Publisher, error) {
+	return &Publisher{
+		js:     js,
+		cfg:    cfg,
+		logger: logger,
+	}, nil
+}
+
+// Publish publishes a message
+func (p *Publisher) Publish(message interface{}) error {
+	topic := p.cfg.Publisher.Topic
+	if topic == "" {
+		return fmt.Errorf("publisher topic is not configured")
+	}
+
+	// Marshal message to JSON
+	messageBytes, err := json.Marshal(message)
+	if err != nil {
+		return fmt.Errorf("failed to marshal message: %w", err)
+	}
+
+	// Publish to JetStream
+	_, err = p.js.Publish(topic, messageBytes)
+	if err != nil {
+		return fmt.Errorf("failed to publish message: %w", err)
+	}
+
+	p.logger.Debug("Published message",
+		zap.String("topic", topic),
+		zap.Int("size", len(messageBytes)),
+	)
+
+	return nil
+}