Add Discord client, command router and voice channel handling

internal/discord/router.go

@@ -0,0 +1,36 @@
+package discord
+
+import (
+	"context"
+	"log/slog"
+
+	"github.com/disgoorg/disgo/events"
+
+	"discord-music-bot/internal/commands"
+)
+
+type Router struct {
+	registry *commands.Registry
+	logger   *slog.Logger
+}
+
+func NewRouter(registry *commands.Registry, logger *slog.Logger) *Router {
+	return &Router{
+		registry: registry,
+		logger:   logger,
+	}
+}
+
+func (r *Router) OnApplicationCommand(event *events.ApplicationCommandInteractionCreate) {
+	name := event.SlashCommandInteractionData().CommandName()
+
+	cmd, ok := r.registry.Get(name)
+	if !ok {
+		r.logger.Warn("received unknown command", slog.String("command", name))
+		return
+	}
+
+	if err := cmd.Execute(context.Background(), event); err != nil {
+		r.logger.Error("command execution failed", slog.String("command", name), slog.Any("err", err))
+	}
+}