feat: persist hitl default config

internal/handler/config.go

@@ -891,7 +891,14 @@ func (h *ConfigHandler) UpdateConfig(c *gin.Context) {
 	if req.Hitl != nil {
 		h.config.Hitl.AuditModel = req.Hitl.AuditModel
 		h.config.Hitl.ToolWhitelist = mergeHitlToolWhitelistSlice(nil, req.Hitl.ToolWhitelist)
+		if strings.TrimSpace(req.Hitl.DefaultMode) != "" {
+			h.config.Hitl.DefaultMode = req.Hitl.EffectiveDefaultMode()
+		}
 		h.config.Hitl.DefaultReviewer = req.Hitl.EffectiveDefaultReviewer()
+		if req.Hitl.DefaultTimeoutSeconds != nil {
+			v := req.Hitl.EffectiveDefaultTimeoutSeconds()
+			h.config.Hitl.DefaultTimeoutSeconds = &v
+		}
 		h.config.Hitl.AuditAgentPrompt = strings.TrimSpace(req.Hitl.AuditAgentPrompt)
 		h.config.Hitl.AuditAgentPromptReviewEdit = strings.TrimSpace(req.Hitl.AuditAgentPromptReviewEdit)
 		if req.Hitl.RetentionDays != nil {
@@ -2141,12 +2148,35 @@ func updateHitlConfig(doc *yaml.Node, cfg config.HitlConfig) {
 	setStringInMap(auditModelNode, "model", cfg.AuditModel.Model)
 	// flow 样式 [a, b, c] 单行展示，工具多时比块序列省行数
 	setFlowStringSliceInMap(hitlNode, "tool_whitelist", cfg.ToolWhitelist)
+	setStringInMap(hitlNode, "default_mode", cfg.EffectiveDefaultMode())
 	setStringInMap(hitlNode, "default_reviewer", cfg.EffectiveDefaultReviewer())
+	setIntInMap(hitlNode, "default_timeout_seconds", cfg.EffectiveDefaultTimeoutSeconds())
 	setIntInMap(hitlNode, "retention_days", cfg.RetentionDaysEffective())
 	setStringInMap(hitlNode, "audit_agent_prompt", cfg.AuditAgentPrompt)
 	setStringInMap(hitlNode, "audit_agent_prompt_review_edit", cfg.AuditAgentPromptReviewEdit)
 }
 
+// UpdateHitlDefaultConfig 更新全局默认人机协同配置并写入 config.yaml。
+func (h *ConfigHandler) UpdateHitlDefaultConfig(mode, reviewer string, timeoutSeconds int) error {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	h.config.Hitl.DefaultMode = config.HitlConfig{DefaultMode: mode}.EffectiveDefaultMode()
+	h.config.Hitl.DefaultReviewer = config.HitlConfig{DefaultReviewer: reviewer}.EffectiveDefaultReviewer()
+	if timeoutSeconds < 0 {
+		timeoutSeconds = 0
+	}
+	h.config.Hitl.DefaultTimeoutSeconds = &timeoutSeconds
+	if err := h.saveConfig(); err != nil {
+		return err
+	}
+	h.logger.Info("HITL 全局默认配置已写入配置文件",
+		zap.String("default_mode", h.config.Hitl.DefaultMode),
+		zap.String("default_reviewer", h.config.Hitl.DefaultReviewer),
+		zap.Int("default_timeout_seconds", timeoutSeconds),
+	)
+	return nil
+}
+
 // UpdateHitlDefaultReviewer 更新全局默认审批方并写入 config.yaml。
 func (h *ConfigHandler) UpdateHitlDefaultReviewer(reviewer string) error {
 	h.mu.Lock()