Refactor kafka to pure Go (franz-go), fix DBC stubs, update Dockerfile

pkg/kafka/config.go

@@ -0,0 +1,45 @@
+package kafka
+
+import (
+	"strings"
+	"time"
+
+	"github.com/fiskerinc/cloud-services/pkg/utils/envtool"
+	"github.com/twmb/franz-go/pkg/kgo"
+)
+
+// Config holds kafka connection configuration
+type Config struct {
+	Brokers           []string
+	SecurityProtocol  string
+	SessionTimeout    time.Duration
+	HeartbeatInterval time.Duration
+}
+
+// LoadConfig loads kafka configuration from environment
+func LoadConfig() Config {
+	hosts := envtool.GetEnv("KAFKA_HOSTS", "localhost:9092")
+	brokers := strings.Split(hosts, ",")
+	for i := range brokers {
+		brokers[i] = strings.TrimSpace(brokers[i])
+	}
+
+	return Config{
+		Brokers:           brokers,
+		SecurityProtocol:  envtool.GetEnv("KAFKA_SECURITY_PROTOCOL", "plaintext"),
+		SessionTimeout:    time.Duration(envtool.GetEnvInt("KAFKA_SESSION_TIMEOUT_MS", 45000)) * time.Millisecond,
+		HeartbeatInterval: time.Duration(envtool.GetEnvInt("KAFKA_HEARTBEAT_INTERVAL_MS", 3000)) * time.Millisecond,
+	}
+}
+
+// buildClientOpts creates common kgo.Opt slice from config
+func buildClientOpts(cfg Config) []kgo.Opt {
+	opts := []kgo.Opt{
+		kgo.SeedBrokers(cfg.Brokers...),
+	}
+
+	// SASL can be added here if needed in the future
+	// For now we use PLAINTEXT (no auth) for the mini cluster
+
+	return opts
+}