[Fix] 투표 결과 비율 계산에 double 타입 적용

Author: soonge2

src/main/java/com/moa/moa_server/domain/vote/dto/response/VoteOptionResultWithId.java

@@ -4,5 +4,5 @@ public record VoteOptionResultWithId(
         Long voteId,
         int optionNumber,
         int count,
-        int ratio
+        double ratio
 ) {}

src/main/java/com/moa/moa_server/domain/vote/dto/response/result/VoteOptionResult.java

@@ -3,5 +3,5 @@
 public record VoteOptionResult(
         int optionNumber,
         int count,
-        int ratio
+        double ratio
 ) {}

src/main/java/com/moa/moa_server/domain/vote/service/VoteResultService.java

@@ -54,12 +54,12 @@ private List<ResultRaw> getResultsInternal(Vote vote) {
         return Stream.of(1,2)
                 .map(option -> {
                     int count = countMap.getOrDefault(option, 0L).intValue();
-                    int ratio = totalCount == 0 ? 0 : (int) ((count * 100.0) / totalCount);
+                    double ratio = totalCount == 0 ? 0.0 : (count * 100.0) / totalCount;
                     return new ResultRaw(option, count, ratio);
                 })
                 .toList();
     }
 
-    private record ResultRaw(int optionNumber, int count, int ratio) {}
+    private record ResultRaw(int optionNumber, int count, double ratio) {}
 
 }