fix(provider): 延长媒体超时并终止超时轮转

将图像和视频的默认 HTTP/轮询超时分别提高到 20 分钟和 30 分钟。媒体任务超时后直接失败，不再重试、切换客户端或标记为 upstream_submission_unknown。OpenAI 图像端点遇到上游明确拒绝 response_format 时自动移除并缓存兼容结论。

验证：go test ./... -count=1；go vet ./...；gofmt；相关 Shell bash -n、ShellCheck 与发布脚本回归测试。

apps/api/internal/runner/service.go

@@ -81,6 +81,10 @@ type upstreamSubmissionUnknownError struct {
 	Cause     error
 }
 
+func shouldClassifyUpstreamSubmissionUnknown(simulated bool, submissionStatus string, err error) bool {
+	return !simulated && submissionStatus == "submitting" && clients.ErrorCode(err) != "timeout"
+}
+
 func (e *upstreamSubmissionUnknownError) Error() string {
 	return "upstream submission result is unknown"
 }
@@ -1105,6 +1109,7 @@ candidatesLoop:
 					FailoverExpired:   failoverTimeBudgetExceeded(executeStartedAt, maxFailoverDuration),
 					Async:             task.AsyncMode,
 					DownstreamStarted: downstreamStarted.Load(),
+					TaskKind:          task.Kind,
 				})
 				if candidateDecision.Route == "requeue" {
 					if _, platformLimited := platformModelRateLimitError(err); platformLimited {
@@ -1162,6 +1167,7 @@ candidatesLoop:
 				FailoverExpired:   failoverTimeBudgetExceeded(executeStartedAt, maxFailoverDuration),
 				Async:             task.AsyncMode,
 				DownstreamStarted: downstreamStarted.Load(),
+				TaskKind:          task.Kind,
 			})
 			candidateDecisionAttempt = attemptNo
 			candidateClientAttempt = clientAttempt
@@ -1431,7 +1437,7 @@ func (s *Service) runCandidate(
 	}
 	defer s.store.RecordClientRelease(context.WithoutCancel(ctx), candidate.ClientID, "")
 
-	requestHTTPClient, err := s.httpClientForCandidate(candidate, simulated)
+	requestHTTPClient, err := s.httpClientForCandidate(candidate, simulated, task.Kind)
 	if err != nil {
 		_ = s.store.FinishTaskAttempt(ctx, store.FinishTaskAttemptInput{
 			AttemptID:    attemptID,
@@ -1685,7 +1691,7 @@ func (s *Service) runCandidate(
 			ErrorMessage:             err.Error(),
 		})
 		_ = s.emit(ctx, task.ID, "task.attempt.failed", "running", "attempt_failed", 0.45, err.Error(), map[string]any{"attempt": attemptNo, "retryable": retryable, "requestId": requestID, "statusCode": clients.ErrorResponseMetadata(err).StatusCode, "metrics": metrics}, simulated)
-		if !simulated && submissionStatus == "submitting" {
+		if shouldClassifyUpstreamSubmissionUnknown(simulated, submissionStatus, err) {
 			return clients.Response{}, &upstreamSubmissionUnknownError{AttemptID: attemptID, Cause: err}
 		}
 		return clients.Response{}, err