Refine travel reimbursement steward flow

Align planner, runtime rules, and policy assets so travel guidance
matches the updated reimbursement workflow.

server/src/app/services/steward_intent_agent.py

@@ -108,6 +108,9 @@ class StewardIntentAgent:
                     "用户描述未来出差、差旅计划、去某地几天、部署、支撑、拜访或会议安排时，"
                     "即使没有出现“申请”两个字，也必须优先识别为 expense_application。"
                     "用户描述已经发生的费用、昨天/前天费用、票据或明确报销诉求时，才识别为 reimbursement。"
+                    "如果用户只描述出差时间、地点和事由，但没有明确申请、报销、提交、保存草稿等动作，"
+                    "且无法从上下文判断流程方向，必须返回 pending_flow_confirmation.status=pending，"
+                    "candidate_flows 同时给出 travel_application 和 travel_reimbursement，tasks 保持空数组。"
                     "所有 ontology_fields 只能使用调用方给出的 canonical_ontology_fields；"
                     "如果输入里出现 occurred_date、transport_type、reason_value 等别名，必须映射为 canonical 字段。"
                     "相对日期必须以 base_date 为准转换为明确日期。"
@@ -180,6 +183,56 @@ class StewardIntentAgent:
                                 ],
                             },
                         },
+                        "pending_flow_confirmation": {
+                            "type": "object",
+                            "properties": {
+                                "status": {
+                                    "type": "string",
+                                    "enum": ["none", "pending"],
+                                },
+                                "source_message": {"type": "string"},
+                                "reason": {"type": "string"},
+                                "candidate_flows": {
+                                    "type": "array",
+                                    "items": {
+                                        "type": "object",
+                                        "properties": {
+                                            "flow_id": {
+                                                "type": "string",
+                                                "enum": ["travel_application", "travel_reimbursement"],
+                                            },
+                                            "label": {"type": "string"},
+                                            "confidence": {
+                                                "type": "number",
+                                                "minimum": 0,
+                                                "maximum": 1,
+                                            },
+                                            "reason": {"type": "string"},
+                                            "ontology_fields": {
+                                                "type": "object",
+                                                "additionalProperties": {"type": "string"},
+                                            },
+                                            "missing_fields": {
+                                                "type": "array",
+                                                "items": {
+                                                    "type": "string",
+                                                    "enum": canonical_fields,
+                                                },
+                                            },
+                                        },
+                                        "required": [
+                                            "flow_id",
+                                            "label",
+                                            "confidence",
+                                            "reason",
+                                            "ontology_fields",
+                                            "missing_fields",
+                                        ],
+                                    },
+                                },
+                            },
+                            "required": ["status", "source_message", "reason", "candidate_flows"],
+                        },
                         "attachment_groups": {
                             "type": "array",
                             "items": {