refactor: Validation 용 어노테이션 추가

Author: InJunKangW

src/main/java/com/example/log4u/domain/reports/dto/ReportCreateRequestDto.java

@@ -2,9 +2,16 @@
 
 import com.example.log4u.domain.reports.entity.Report;
 import com.example.log4u.domain.reports.reportType.ReportType;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import org.hibernate.validator.constraints.Length;
 
 public record ReportCreateRequestDto(
+    @NotNull
     ReportType reportType,
+
+    @NotBlank
+    @Length(min = 2)
     String content
 ) {
     public Report toEntity(Report.ReportTargetType reportTargetType, Long targetId){

src/main/java/com/example/log4u/domain/supports/dto/SupportCreateRequestDto.java

@@ -3,9 +3,11 @@
 import com.example.log4u.domain.supports.entity.Support;
 import com.example.log4u.domain.supports.supportType.SupportType;
 import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
 import org.hibernate.validator.constraints.Length;
 
 public record SupportCreateRequestDto(
+        @NotNull
         SupportType supportType,
 
         @NotBlank