[Feat] PR 코드 리팩토링

motivation:
- PR(#153)에서 받은 comment 를 통해 몇몇 코드를 변경하였습니다.

modification:
- `VotingApiRequest.java` `@Positive` 추가

app/src/main/java/fc/be/app/domain/vote/controller/dto/request/VotingApiRequest.java

@@ -1,9 +1,10 @@
 package fc.be.app.domain.vote.controller.dto.request;
 
 import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Positive;
 
 public record VotingApiRequest(
-        @NotNull Long voteId,
-        @NotNull Long candidateId
+        @Positive @NotNull Long voteId,
+        @Positive @NotNull Long candidateId
 ) {
 }