前端增加3：4选择

backend/internal/billing/service_test.go

@@ -44,6 +44,25 @@ func TestServiceQuoteNormalizesPayloadAndSeedsDefaultsThroughOptionalCapability(
 	}
 }
 
+func TestServiceQuoteSupportsEvoLinkThreeByFourPreset(t *testing.T) {
+	store := &quoteStoreStub{rules: []PriceRule{{
+		ID: "evolink-3-4", Provider: "evolink", Capability: "image.generate", ReqKey: "gpt-image-2",
+		Unit: UnitImage, StandardUnitPriceFen: 34, MarkupMultiplier: 1.2, Enabled: true, Dimensions: evolinkDimensions(),
+	}}}
+	quote, err := NewService(store, nil).Quote(context.Background(), QuoteCommand{
+		Provider: "evolink", Capability: "image.generate", ReqKey: "gpt-image-2",
+		Payload: map[string]any{"input": map[string]any{
+			"width": 1728.0, "height": 2304.0, "quality": "medium",
+		}},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if quote.AmountFen != 41 || quote.Parameters["aspectRatio"] != "3:4" {
+		t.Fatalf("quote = %#v", quote)
+	}
+}
+
 func TestServiceQuoteDisabledReturnsNilWithoutAccessingRules(t *testing.T) {
 	store := &quoteStoreStub{failOnAccess: true}
 	quote, err := NewService(store, nil).SetEnabled(false).Quote(context.Background(), QuoteCommand{Provider: "seedance", Capability: "video.generate"})