feat(listings): 折算比按整数展示并统一筛选口径

backend/internal/modules/listing/public_filter.go

@@ -1,6 +1,7 @@
 package listing
 
 import (
+	"math"
 	"sort"
 	"strconv"
 	"strings"
@@ -63,7 +64,9 @@ func matchesPublicQuery(item ListingDTO, query PublicListQuery) bool {
 	if !numberInRange(coinM, NumberRange{Min: query.MinCoin, Max: query.MaxCoin}) {
 		return false
 	}
-	if !numberInRange(ratioFromListing(item), NumberRange{Min: query.MinRatio, Max: query.MaxRatio}) {
+	// 折算比在前端按四舍五入取整展示，筛选必须用同一口径，
+	// 否则会出现「显示 35w 却不在 35-40 区间」的错位。
+	if !numberInRange(math.Round(ratioFromListing(item)), NumberRange{Min: query.MinRatio, Max: query.MaxRatio}) {
 		return false
 	}
 	if !numberInRange(price, NumberRange{Min: query.MinPrice, Max: query.MaxPrice}) {

backend/internal/modules/listing/public_filter_test.go

@@ -21,6 +21,31 @@ func TestFilterPublicListingsByRatio(t *testing.T) {
 	}
 }
 
+func TestFilterPublicListingsByRoundedRatio(t *testing.T) {
+	minRatio := 30.0
+	maxRatio := 35.0
+	items := []ListingDTO{
+		{ID: 1, AssetSummary: map[string]any{"publish_ratio": 29.4}}, // 29w，区间外
+		{ID: 2, AssetSummary: map[string]any{"publish_ratio": 34.4}}, // 34w，区间内
+		{ID: 3, AssetSummary: map[string]any{"publish_ratio": 34.6}}, // 35w，区间内
+		{ID: 4, AssetSummary: map[string]any{"publish_ratio": 35.4}}, // 35w，区间内（与展示一致）
+		{ID: 5, AssetSummary: map[string]any{"publish_ratio": 35.6}}, // 36w，区间外
+		// 无 publish_ratio 时按「万币 / 元」兜底计算：34.6w → 35w
+		{ID: 6, HafCoinAmount: 34_600_000, PriceCent: 10_000},
+	}
+
+	filtered := filterPublicListings(items, PublicListQuery{MinRatio: &minRatio, MaxRatio: &maxRatio})
+
+	if len(filtered) != 4 {
+		t.Fatalf("expected 4 listings after rounding, got %#v", filtered)
+	}
+	for i, wantID := range []uint64{2, 3, 4, 6} {
+		if filtered[i].ID != wantID {
+			t.Fatalf("at index %d, expected listing %d, got %d", i, wantID, filtered[i].ID)
+		}
+	}
+}
+
 func TestFilterPublicListingsRegionMultiSelectRequiresAll(t *testing.T) {
 	items := []ListingDTO{
 		{