사용 가능 공간 조회 API 추가

src/main/java/com/kamco/cd/training/dataset/DatasetApiController.java

@@ -4,6 +4,7 @@ import com.kamco.cd.training.config.api.ApiResponseDto;
 import com.kamco.cd.training.dataset.dto.DatasetDto;
 import com.kamco.cd.training.dataset.dto.DatasetObjDto;
 import com.kamco.cd.training.dataset.dto.DatasetObjDto.DatasetClass;
+import com.kamco.cd.training.dataset.dto.DatasetObjDto.DatasetStorage;
 import com.kamco.cd.training.dataset.service.DatasetService;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
@@ -216,4 +217,22 @@ public class DatasetApiController {
       @Parameter(description = "compare, target", example = "compare") @RequestParam String type) {
     return ApiResponseDto.ok(datasetService.getDatasetObjByUuid(uuid, type));
   }
+
+  @Operation(summary = "남은 저장공간 조회", description = "남은 저장공간 조회 API")
+  @ApiResponses(
+      value = {
+        @ApiResponse(
+            responseCode = "200",
+            description = "조회 성공",
+            content =
+                @Content(
+                    mediaType = "application/json",
+                    schema = @Schema(implementation = Page.class))),
+        @ApiResponse(responseCode = "404", description = "저장 공간 조회 오류", content = @Content),
+        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
+      })
+  @GetMapping("/usable-bytes")
+  public ApiResponseDto<DatasetStorage> getUsableBytes() {
+    return ApiResponseDto.ok(datasetService.getUsableBytes());
+  }
 }