refactor(task): extract billing and polling logic from controller to service layer

Restructure the task relay system for better separation of concerns:
- Extract task billing into service/task_billing.go with unified settlement flow
- Move task polling loop from controller to service/task_polling.go (supports Suno + video platforms)
- Split RelayTask into fetch/submit paths with dedicated retry logic (taskSubmitWithRetry)
- Add TaskDto, TaskResponse generics, and FetchReq to dto/task.go
- Add taskcommon/helpers.go for shared task adaptor utilities
- Remove controller/task_video.go (logic consolidated into service layer)
- Update all task adaptors (ali, doubao, gemini, hailuo, jimeng, kling, sora, suno, vertex, vidu)
- Simplify frontend task logs to use new TaskDto response format

types/price_data.go

@@ -22,7 +22,8 @@ type PriceData struct {
 	AudioCompletionRatio float64
 	OtherRatios          map[string]float64
 	UsePrice             bool
-	QuotaToPreConsume    int // 预消耗额度
+	Quota                int // 按次计费的最终额度（MJ / Task）
+	QuotaToPreConsume    int // 按量计费的预消耗额度
 	GroupRatioInfo       GroupRatioInfo
 }
 
@@ -36,12 +37,6 @@ func (p *PriceData) AddOtherRatio(key string, ratio float64) {
 	p.OtherRatios[key] = ratio
 }
 
-type PerCallPriceData struct {
-	ModelPrice     float64
-	Quota          int
-	GroupRatioInfo GroupRatioInfo
-}
-
 func (p *PriceData) ToSetting() string {
 	return fmt.Sprintf("ModelPrice: %f, ModelRatio: %f, CompletionRatio: %f, CacheRatio: %f, GroupRatio: %f, UsePrice: %t, CacheCreationRatio: %f, CacheCreation5mRatio: %f, CacheCreation1hRatio: %f, QuotaToPreConsume: %d, ImageRatio: %f, AudioRatio: %f, AudioCompletionRatio: %f", p.ModelPrice, p.ModelRatio, p.CompletionRatio, p.CacheRatio, p.GroupRatioInfo.GroupRatio, p.UsePrice, p.CacheCreationRatio, p.CacheCreation5mRatio, p.CacheCreation1hRatio, p.QuotaToPreConsume, p.ImageRatio, p.AudioRatio, p.AudioCompletionRatio)
 }