Remove concurrency config

Inference engines handle this now.

internal/service/service.go

@@ -29,7 +29,6 @@ import (
 
 	"github.com/google/uuid"
 	openai "github.com/sashabaranov/go-openai"
-	"golang.org/x/sync/semaphore"
 )
 
 //go:embed all:static/*
@@ -42,7 +41,6 @@ type Service struct {
 	llm    *llm.Client
 	log    *slog.Logger
 	mux    *http.ServeMux
-	sem    *semaphore.Weighted
 	server *http.Server
 	stt    *stt.Client
 	tmpl   *template.Template
@@ -57,7 +55,6 @@ func New(cfg *config.Config, log *slog.Logger) (*Service, error) {
 		cfg: cfg,
 		log: log,
 		mux: http.NewServeMux(),
-		sem: semaphore.NewWeighted(int64(cfg.Concurrency)),
 	}
 
 	// Setup tool registry.
@@ -193,7 +190,6 @@ func (svc *Service) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 func (svc *Service) Run(ctx context.Context) error {
 	svc.log.Info(
 		"starting odidere",
-		slog.Int("concurrency", svc.cfg.Concurrency),
 		slog.Group(
 			"llm",
 			slog.String("url", svc.cfg.LLM.URL),
@@ -582,17 +578,6 @@ func (svc *Service) voiceStream(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// Acquire semaphore.
-	if err := svc.sem.Acquire(ctx, 1); err != nil {
-		http.Error(
-			w,
-			"service unavailable",
-			http.StatusServiceUnavailable,
-		)
-		return
-	}
-	defer svc.sem.Release(1)
-
 	var (
 		messages      = req.Messages
 		transcription string