caoxiaozhu
992cf71fa1
refactor(server): Phase 1 图拓扑重构 - LangGraph 成为唯一编排者
P1.3-P1.7：把 endpoint 补丁搬进图节点，门控收敛到 gate_classify 单一决策点。
- StewardGraphState 扩展：recent_history/steward_state/gate_decision/gate_scene_id/conversation_id
- 新增 5 个图节点：load_context（读历史+state）/gate_classify（统一门控）/execute_scene_handler/resume_recent_task/pending_flow wrapper
- 图拓扑从 5 节点重构为 10 节点：load_context → gate_classify → {off_topic/handler_only/resume/ambiguous/model_intent} → attach_action_steps
- gate_classify 四步裁决：resume门 → off_topic门 → 规则匹配门 → LLM门
- resume 门控优先于 off_topic，避免'再提交'被误判闲聊
- schema 放宽 planning_source/next_action Literal → str，支持 scene_handler:*/context_resume/answer_only
- endpoint 按 planner 类型分发 build_plan（LangGraph 接 db，legacy 不接）
- 76 passed + 4 场景端到端验证（出差申请/再提交/查差旅标准/闲聊）
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