fix: regulatory 对话模式改用 event_stream_handler 修复工具调用截断，优化节点 prompt 和日志展示

- regulatory_node: stream_working 从 run_stream 改为 agent.run + event_stream_handler，
  解决工具调用后文本被截断的问题；添加 PartStartEvent 处理修复首字丢失
- consciousness_node: prompt 重写为三模式（生成/执行/报告），强调禁止编造 agent_id
- workflow API: _merge_runtime_status 暴露步骤输出内容（workflow_log 第三元素）
- 前端日志: 系统日志改为终端滚动样式，工作流步骤可展开查看输出

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

kilostar/api/workflow.py

@@ -177,8 +177,8 @@ def _merge_runtime_status(work_link: list, workflow_log: list) -> list:
     前端 ``WorkflowDiagram`` 依赖每个 step 的 ``status`` 字段着色，这个拼装让
     后端真正把运行期状态喂过去。
     """
-    # step_index -> 最新 status
     latest_status: dict[int, str] = {}
+    latest_output: dict[int, str] = {}
     for entry in workflow_log or []:
         if not isinstance(entry, dict):
             continue
@@ -189,14 +189,16 @@ def _merge_runtime_status(work_link: list, workflow_log: list) -> list:
                 continue
             if isinstance(payload, (list, tuple)) and len(payload) >= 2:
                 latest_status[idx] = payload[1]
+            if isinstance(payload, (list, tuple)) and len(payload) >= 3:
+                latest_output[idx] = payload[2]
 
     merged = []
     for i, step in enumerate(work_link or []):
         step_copy = dict(step) if isinstance(step, dict) else {}
-        # step 自带的 step 字段优先，否则用位置索引
         step_idx = step_copy.get("step")
         lookup_idx = (step_idx - 1) if isinstance(step_idx, int) else i
         step_copy["status"] = latest_status.get(lookup_idx, "pending")
+        step_copy["output"] = latest_output.get(lookup_idx, "")
         merged.append(step_copy)
     return merged