fix: Init 前 AcquireRoundtableRoom

与 Java 对齐，避免新版 Gateway「会商会话标识缺失」。

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/deerflow/client.go

@@ -86,8 +86,40 @@ type InitMultiAgentOpts struct {
 	RoomSessionID string
 }
 
+// AcquireRoundtableRoom 占用一步会商房间。新版 Gateway 的 init 只续租不新建，
+// 缺 roomSessionId / 未 acquire 时会报「会商会话标识缺失」。
+func (c *Client) AcquireRoundtableRoom(draftID, taskID, roomSessionID string) error {
+	draftID = strings.TrimSpace(draftID)
+	roomSessionID = strings.TrimSpace(roomSessionID)
+	if draftID == "" || roomSessionID == "" {
+		return fmt.Errorf("缺少会商标识（draftId/roomSessionId），无法占用研讨房间")
+	}
+	body := map[string]interface{}{
+		"draftId":       draftID,
+		"roomSessionId": roomSessionID,
+	}
+	if t := strings.TrimSpace(taskID); t != "" {
+		body["taskId"] = t
+	}
+	raw, err := c.postJSON("/api/roundtable-rooms/acquire", body)
+	if err != nil {
+		return err
+	}
+	var resp map[string]interface{}
+	_ = json.Unmarshal(raw, &resp)
+	if ok, has := resp["ok"].(bool); has && !ok {
+		msg := fmt.Sprint(resp["message"])
+		if msg == "" || msg == "<nil>" {
+			msg = "占用会商房间失败"
+		}
+		return fmt.Errorf("%s", msg)
+	}
+	logging.L.Infow("DeerFlow 房间已占用", "draftId", draftID, "roomSessionId", roomSessionID)
+	return nil
+}
+
 // InitMultiAgent 建多席线程，返回 agentName → threadId。
-// draft_id 在内网较新 Gateway 上是「会商标识」，缺了会 4xx。
+// draft_id 在内网较新 Gateway 上是「会商标识」，缺了会 4xx。调用前须 AcquireRoundtableRoom。
 func (c *Client) InitMultiAgent(agentNames []string, mainAgent, model string, opts InitMultiAgentOpts) (map[string]string, error) {
 	body := map[string]interface{}{
 		"agent_names":     agentNames,
@@ -366,6 +398,35 @@ func (c *Client) readSSE(
 	return scanner.Err()
 }
 
+func (c *Client) postJSON(path string, body map[string]interface{}) ([]byte, error) {
+	token, err := c.auth.BearerToken()
+	if err != nil {
+		return nil, err
+	}
+	raw, err := json.Marshal(body)
+	if err != nil {
+		return nil, err
+	}
+	req, err := http.NewRequest(http.MethodPost, c.cfg.DeerFlowBaseURL+path, bytes.NewReader(raw))
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("Authorization", "Bearer "+token)
+	client := &http.Client{Timeout: 30 * time.Second}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	out, _ := io.ReadAll(resp.Body)
+	if resp.StatusCode >= 400 {
+		return nil, fmt.Errorf("DeerFlow %s HTTP %d: %s", path, resp.StatusCode, string(out))
+	}
+	return out, nil
+}
+
 func isFinalStatusFrame(v map[string]interface{}) bool {
 	if v == nil {
 		return false

internal/worker/live_runner.go

@@ -88,6 +88,12 @@ func (r *LiveChainRunner) Run(job *domain.AnalysisJob) {
 		if dfTaskID == "" {
 			dfTaskID = job.TaskID
 		}
+		putProgress(job, 3, "正在占用会商房间…")
+		r.flush(job)
+		if err := r.DF.AcquireRoundtableRoom(job.DraftID, dfTaskID, roomSessionID); err != nil {
+			r.fail(job, err.Error())
+			return
+		}
 		tids, err := r.DF.InitMultiAgent(agentNames, r.Coord, job.Model, deerflow.InitMultiAgentOpts{
 			DraftID:       job.DraftID,
 			TaskID:        dfTaskID,