fix: suppress fallback recommendations when concrete hits exist

- detect concrete recommend hits before normalizing results
- drop fallback results when any syntax path returns real candidates
- keep fallback candidates only when every path has no concrete hit

model/redis_recommend.go

@@ -124,6 +124,7 @@ func levelOneRedisSearch(ctx context.Context, rdb *redis.Client, hierarchy const
 func RedisSearchRecommend(ctx context.Context, input string) map[string]SearchResult {
 	rdb := diagram.GetRedisClientInstance()
 	finalizeResults := func(results map[string]SearchResult) map[string]SearchResult {
+		results = suppressFallbackResultsWhenConcreteHitExists(results)
 		return normalizeRecommendResults(input, results)
 	}
 
@@ -281,6 +282,27 @@ func RedisSearchRecommend(ctx context.Context, input string) map[string]SearchRe
 	}
 }
 
+func suppressFallbackResultsWhenConcreteHitExists(results map[string]SearchResult) map[string]SearchResult {
+	hasConcreteHit := false
+	for _, result := range results {
+		if result.Err == nil && !result.IsFallback && len(result.QueryDatas) > 0 {
+			hasConcreteHit = true
+			break
+		}
+	}
+
+	if !hasConcreteHit {
+		return results
+	}
+
+	for key, result := range results {
+		if result.IsFallback {
+			delete(results, key)
+		}
+	}
+	return results
+}
+
 func normalizeRecommendResults(input string, results map[string]SearchResult) map[string]SearchResult {
 	for key, result := range results {
 		if result.Err != nil {