fix: lint warnings - errcheck and switch style

internal/playback/handler/handler.go

@@ -176,11 +176,11 @@ func (h *PlaybackHandler) HandleProxyStream(c *gin.Context) {
 		c.Status(http.StatusBadGateway)
 		return
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	for k, v := range resp.Header {
 		c.Header(k, v[0])
 	}
 	c.Status(resp.StatusCode)
-	io.Copy(c.Writer, resp.Body)
+	_, _ = io.Copy(c.Writer, resp.Body)
 }

internal/playback/service/service.go

@@ -348,9 +348,10 @@ func (s *playbackService) fetchSkipSegments(ctx context.Context, malID int, epis
 	segments := make([]SkipSegment, 0, len(parsed.Result))
 	for _, r := range parsed.Result {
 		skipType := strings.ToLower(r.SkipType)
-		if skipType == "op" {
+		switch skipType {
+		case "op":
 			skipType = "opening"
-		} else if skipType == "ed" {
+		case "ed":
 			skipType = "ending"
 		}
 		segments = append(segments, SkipSegment{