Fix popular words API response by view count-based retrieval

src/main/java/com/dnd/spaced/domain/word/application/WordService.java

@@ -94,7 +94,7 @@ public List<WordSearchInfoDto> search(SearchWordConditionInfoDto dto) {
     }
 
     public List<PopularWordInfoDto> findPopularAll(Pageable pageable) {
-        List<Word> result = popularWordRepository.findAllBy(LocalDateTime.now(clock), pageable);
+        List<Word> result = popularWordRepository.findByViewCount(pageable);
 
         return WordServiceMapper.from(result);
     }

src/main/java/com/dnd/spaced/domain/word/domain/repository/PopularWordRepository.java

@@ -16,6 +16,8 @@ public interface PopularWordRepository {
 
     List<Word> findAllBy(LocalDateTime target, Pageable pageable);
 
+    List<Word> findByViewCount(Pageable pageable);
+
     Optional<PopularWordMetadata> findBy(Long wordId, LocalDateTime target);
 
     Optional<PopularWordSchedule> findBy(LocalDateTime target);

src/main/java/com/dnd/spaced/domain/word/domain/repository/QuerydslPopularWordMetadataRepository.java

@@ -69,6 +69,14 @@ public List<Word> findAllBy(LocalDateTime target, Pageable pageable) {
         return result;
     }
 
+    @Override
+    public List<Word> findByViewCount(Pageable pageable) {
+        return queryFactory.selectFrom(word)
+                .orderBy(word.viewCount.desc())
+                .limit(pageable.getPageSize())
+                .fetch();
+    }
+
     @Override
     public Optional<PopularWordMetadata> findBy(Long wordId, LocalDateTime target) {
         PopularWordMetadata result = queryFactory.selectFrom(popularWordMetadata)