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/clients/parameter_correction.go

@@ -22,6 +22,7 @@ var safeUpstreamCorrectionParameters = stringSet(
 	"temperature", "top_p", "frequency_penalty", "presence_penalty", "seed", "stop", "n",
 	"max_tokens", "max_completion_tokens", "max_output_tokens",
 	"logprobs", "top_logprobs", "service_tier", "verbosity",
+	"response_format",
 )
 
 var (
@@ -286,6 +287,12 @@ func callerProtectedCorrectionParameters(request Request, endpointKind string) m
 			}
 		}
 	}
+	if endpointKind == "images.generations" || endpointKind == "images.edits" {
+		// The Gateway canonicalizes image output independently of the provider's
+		// URL/Base64 preference. Allow an explicitly supplied response_format to
+		// be removed only after the selected upstream rejects it as unsupported.
+		delete(protected, "response_format")
+	}
 	return protected
 }