refactor: streamline JSON response structure in channel API endpoints

controller/channel.go

@@ -237,10 +237,20 @@ func SearchChannels(c *gin.Context) {
 		}
 		channelData = channels
 	}
+
+	// calculate type counts for search results
+	typeCounts := make(map[int64]int64)
+	for _, channel := range channelData {
+		typeCounts[int64(channel.Type)]++
+	}
+
 	c.JSON(http.StatusOK, gin.H{
 		"success": true,
 		"message": "",
-		"data":    channelData,
+		"data": gin.H{
+			"items":       channelData,
+			"type_counts": typeCounts,
+		},
 	})
 	return
 }