refactor(hot-rank): extract scored type to package level as hotRankScored

Move the scoped 'scored' struct definition to package level and rename
to hotRankScored to enable reuse across Refresh and refreshChannelRanks
methods, eliminating duplicate type definitions.

internal/service/hot_rank_worker.go

@@ -17,6 +17,11 @@ import (
 	"go.uber.org/zap"
 )
 
+type hotRankScored struct {
+	idx  int
+	norm float64
+}
+
 // HotRankWorker 定时在候选池上重算热门分，写入 Redis ZSET（仅 TopN）及 top_ids（Redis+本地缓存）
 type HotRankWorker struct {
 	cfg        *config.Config
@@ -145,13 +150,8 @@ func (w *HotRankWorker) Refresh(ctx context.Context) error {
 		return nil
 	}
 
-	type scored struct {
-		idx  int
-		norm float64
-	}
-
 	var snapshots []repository.PostHotSnapshot
-	var ranked []scored
+	var ranked []hotRankScored
 	if len(candidateIDs) > 0 {
 		snapshots, err = w.postRepo.GetPostHotSnapshotsByIDs(candidateIDs)
 		if err != nil {
@@ -179,7 +179,7 @@ func (w *HotRankWorker) Refresh(ctx context.Context) error {
 		minR := slices.Min(raw)
 		maxR := slices.Max(raw)
 
-		ranked = make([]scored, len(snapshots))
+		ranked = make([]hotRankScored, len(snapshots))
 		for i := range snapshots {
 			var norm float64
 			if maxR > minR {
@@ -187,9 +187,9 @@ func (w *HotRankWorker) Refresh(ctx context.Context) error {
 			} else {
 				norm = 1
 			}
-			ranked[i] = scored{idx: i, norm: norm}
+			ranked[i] = hotRankScored{idx: i, norm: norm}
 		}
-		slices.SortFunc(ranked, func(a, b scored) int {
+		slices.SortFunc(ranked, func(a, b hotRankScored) int {
 			if a.norm != b.norm {
 				return cmp.Compare(b.norm, a.norm) // 降序
 			}
@@ -364,13 +364,11 @@ func (w *HotRankWorker) refreshChannelRanks(
 			continue
 		}
 
-		var chSnapshots []repository.PostHotSnapshot
-		var chRanked []scored
-		filteredSnaps, ferr := w.postRepo.GetPostHotSnapshotsByIDs(chCandidateIDs)
-		if ferr != nil || len(filteredSnaps) == 0 {
+		var chRanked []hotRankScored
+		chSnapshots, ferr := w.postRepo.GetPostHotSnapshotsByIDs(chCandidateIDs)
+		if ferr != nil || len(chSnapshots) == 0 {
 			continue
 		}
-		chSnapshots = filteredSnaps
 
 		now := time.Now()
 		raw := make([]float64, len(chSnapshots))
@@ -391,7 +389,7 @@ func (w *HotRankWorker) refreshChannelRanks(
 		minR := slices.Min(raw)
 		maxR := slices.Max(raw)
 
-		chRanked = make([]scored, len(chSnapshots))
+		chRanked = make([]hotRankScored, len(chSnapshots))
 		for i := range chSnapshots {
 			var norm float64
 			if maxR > minR {
@@ -399,9 +397,9 @@ func (w *HotRankWorker) refreshChannelRanks(
 			} else {
 				norm = 1
 			}
-			chRanked[i] = scored{idx: i, norm: norm}
+			chRanked[i] = hotRankScored{idx: i, norm: norm}
 		}
-		slices.SortFunc(chRanked, func(a, b scored) int {
+		slices.SortFunc(chRanked, func(a, b hotRankScored) int {
 			if a.norm != b.norm {
 				return cmp.Compare(b.norm, a.norm)
 			}