test(acceptance): 在单窗口验证厂商额度峰值

厂商额度验收此前复用了多图与超大图容量素材，3 Worker 的下载和预处理使 24 个任务跨越多个固定分钟窗口，无法精确证明 RPM 与 TPM 上限。\n\n额度场景固定使用三张正常尺寸引用图并为每个任务增加唯一 URL 变体，使请求满足视频协议且能在单窗口完成；6、9 图和超大图转换继续由独立视频容量 profile 覆盖。\n\n验证：\n- go test ./cmd/acceptance-load ./internal/acceptanceworkload -count=1\n- go vet ./cmd/acceptance-load ./internal/acceptanceworkload\n- gofmt -l cmd/acceptance-load/main.go cmd/acceptance-load/main_test.go

apps/api/cmd/acceptance-load/main.go

@@ -640,6 +640,13 @@ func runVideo(
 		combinationCount = 1
 	}
 	combinations := videoCombinations(imageURLs, combinationCount)
+	if name == "video-provider-quota" {
+		// The quota profile must complete in one fixed rate-limit window so
+		// RPM and TPM can be proven at their exact configured ceilings. Use
+		// three distinct normal-sized references per task; larger multi-image
+		// and oversized conversion remain covered by video capacity profiles.
+		combinations = videoProviderQuotaCombinations(imageURLs, combinationCount)
+	}
 	var taskIDs = make([]string, requestCount)
 	latencies := make([]time.Duration, requestCount)
 	startedTasks := make([]time.Time, requestCount)
@@ -658,7 +665,7 @@ func runVideo(
 			logicalIndex := requestOffset + index*requestStride
 			requestStarted := time.Now()
 			startedTasks[index] = requestStarted
-			imageCount := acceptanceworkload.VideoImageCount(logicalIndex)
+			imageCount := videoImageCountForProfile(name, logicalIndex)
 			combo := append([]string(nil), combinations[logicalIndex%len(combinations)]...)
 			if len(combo) > imageCount {
 				combo = combo[:imageCount]
@@ -784,6 +791,7 @@ func runVideo(
 	wg.Wait()
 	uniqueImageCombinations := requestedVideoCombinationCount(
 		combinations,
+		name,
 		requestCount,
 		requestOffset,
 		requestStride,
@@ -1180,8 +1188,46 @@ func videoCombinations(images []string, count int) [][]string {
 	return out
 }
 
+func videoProviderQuotaCombinations(images []string, count int) [][]string {
+	if len(images) == 0 || count <= 0 {
+		return nil
+	}
+	fixtureCount := min(len(images), 4)
+	if fixtureCount < 3 {
+		return nil
+	}
+	out := make([][]string, 0, count)
+	for index := 0; index < count; index++ {
+		combination := make([]string, 0, 3)
+		for imageIndex := 0; imageIndex < 3; imageIndex++ {
+			imageURL := images[(index+imageIndex)%fixtureCount]
+			separator := "?"
+			if strings.Contains(imageURL, "?") {
+				separator = "&"
+			}
+			combination = append(combination, fmt.Sprintf(
+				"%s%sacceptance_quota_variant=%d-%d",
+				imageURL,
+				separator,
+				index,
+				imageIndex,
+			))
+		}
+		out = append(out, combination)
+	}
+	return out
+}
+
+func videoImageCountForProfile(profile string, index int) int {
+	if profile == "video-provider-quota" {
+		return 3
+	}
+	return acceptanceworkload.VideoImageCount(index)
+}
+
 func requestedVideoCombinationCount(
 	combinations [][]string,
+	profile string,
 	requestCount int,
 	requestOffset int,
 	requestStride int,
@@ -1195,7 +1241,7 @@ func requestedVideoCombinationCount(
 	seen := map[string]struct{}{}
 	for index := 0; index < requestCount; index++ {
 		logicalIndex := requestOffset + index*requestStride
-		imageCount := acceptanceworkload.VideoImageCount(logicalIndex)
+		imageCount := videoImageCountForProfile(profile, logicalIndex)
 		combo := combinations[logicalIndex%len(combinations)]
 		if len(combo) > imageCount {
 			combo = combo[:imageCount]