perf(storage): 极简化任务历史并增加保留治理

停止持久化 provider 原始响应、兼容响应快照、attempt/event/outbox 重复 JSON，并由标准任务结果动态生成 Kling/Keling/Volces 兼容响应。

增加事件去重与预算、极简 callback 投递、7/30 天分批清理、安全删除条件、并发迁移索引及可实际恢复的任务域排除备份。历史清理默认关闭，待兼容协议和异步恢复在线验证后单独启用。

验证：Go 全量测试与 go vet、PostgreSQL 18 集成与实际备份恢复、迁移安全测试、bash -n、ShellCheck、Compose 配置和人工发布脚本测试均通过。

apps/api/internal/clients/volces.go

@@ -1100,9 +1100,11 @@ func volcesTaskErrorMessage(result map[string]any) string {
 }
 
 func volcesVideoSuccessResult(request Request, upstreamTaskID string, raw map[string]any) map[string]any {
-	result := cloneMapAny(raw)
-	if result == nil {
-		result = map[string]any{}
+	result := map[string]any{}
+	for _, key := range []string{"seed", "resolution", "ratio", "duration", "frames", "framespersecond"} {
+		if raw[key] != nil {
+			result[key] = raw[key]
+		}
 	}
 	content, _ := raw["content"].(map[string]any)
 	videoURL := strings.TrimSpace(stringFromAny(content["video_url"]))
@@ -1112,18 +1114,18 @@ func volcesVideoSuccessResult(request Request, upstreamTaskID string, raw map[st
 	}
 	data := []any{}
 	if videoURL != "" {
-		data = append(data, map[string]any{"url": videoURL, "type": "video"})
+		item := map[string]any{"url": videoURL, "type": "video"}
+		if lastFrameURL := strings.TrimSpace(stringFromAny(content["last_frame_url"])); lastFrameURL != "" {
+			item["last_frame_url"] = lastFrameURL
+		}
+		data = append(data, item)
 	}
 	result["id"] = firstNonEmpty(stringFromAny(raw["id"]), upstreamTaskID)
-	if strings.TrimSpace(stringFromAny(result["model"])) == "" {
-		result["model"] = upstreamModelName(request.Candidate)
-	}
+	result["model"] = firstNonEmpty(stringFromAny(raw["model"]), upstreamModelName(request.Candidate))
 	result["status"] = "succeeded"
 	result["object"] = "video.generation"
 	result["created"] = created
-	result["upstream_task_id"] = upstreamTaskID
 	result["data"] = data
-	result["raw"] = cloneMapAny(raw)
 	return result
 }