refactor(server): steward 意图改用声明式注册表编排

- 新增 steward_intent_registry，IntentDescriptor 统一描述意图的识别关键词、动作步骤构建、字段白名单与副作用集合，替代分散的 if/else
- 新增 steward_intent_bootstrap 注册 expense_application 等意图；新增 steward_query_executors 提供差旅标准查询的无副作用执行与城市/席别标签化输出
- action_contracts/action_executor/graph_planner/intent_agent/model_plan_builder/planner_extraction/fallback 适配注册表，识别与执行分发自动从注册表取数
- 新增 intent_registry/query_executors 测试，更新 intent_agent 测试

server/tests/test_steward_query_executors.py

@@ -0,0 +1,172 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+from app.schemas.steward import StewardActionExecuteRequest, StewardTask
+from app.services.steward_query_executors import (
+    build_travel_standard_query_steps,
+    execute_travel_standard_query,
+    resolve_travel_standard_snapshot,
+)
+
+
+def _build_current_user(grade: str = "P5") -> SimpleNamespace:
+    return SimpleNamespace(
+        username="test_user",
+        name="测试员工",
+        grade=grade,
+        department_name="技术部",
+        position="工程师",
+        role_codes=["employee"],
+        is_admin=False,
+        employee_no="E00001",
+        manager_name="李总",
+    )
+
+
+def _build_request(
+    *,
+    location: str = "武汉",
+    employee_grade: str = "",
+    standard_category: str = "",
+    message: str = "我去武汉出差的住宿标准是多少",
+) -> StewardActionExecuteRequest:
+    ontology_fields: dict[str, str] = {}
+    if location:
+        ontology_fields["location"] = location
+    if employee_grade:
+        ontology_fields["employee_grade"] = employee_grade
+    if standard_category:
+        ontology_fields["standard_category"] = standard_category
+    task = StewardTask(
+        task_id="task_query_001",
+        task_type="query_travel_standard",
+        assigned_agent="policy_query_assistant",
+        title="差旅标准查询",
+        summary=message,
+        ontology_fields=ontology_fields,
+    )
+    return StewardActionExecuteRequest(
+        action_type="execute_travel_standard_query",
+        message=message,
+        task=task,
+    )
+
+
+def test_resolve_travel_standard_snapshot_returns_lodging_and_transport_for_known_city_and_grade():
+    snapshot = resolve_travel_standard_snapshot(
+        location="武汉",
+        employee_grade="P5",
+    )
+    assert snapshot["location"] == "武汉"
+    assert snapshot["city_tier"] == "tier_2"  # 武汉是二类城市
+    assert snapshot["employee_grade"] == "P5"
+    assert snapshot["lodging"] is not None
+    assert snapshot["lodging"]["daily_cap"] == "480.00"  # P5 + tier_2
+    assert snapshot["transport"] is not None
+    assert snapshot["transport"]["flight_level"] == 1
+    assert snapshot["matched_any"] is True
+
+
+def test_resolve_travel_standard_snapshot_filters_by_standard_category():
+    lodging_only = resolve_travel_standard_snapshot(
+        location="北京",
+        employee_grade="P7",
+        standard_category="lodging",
+    )
+    assert lodging_only["lodging"] is not None
+    assert lodging_only["lodging"]["daily_cap"] == "900.00"  # P7 + tier_1
+    assert lodging_only["transport"] is None
+
+    transport_only = resolve_travel_standard_snapshot(
+        location="北京",
+        employee_grade="P7",
+        standard_category="transport",
+    )
+    assert transport_only["transport"] is not None
+    assert transport_only["transport"]["flight_level"] == 3  # P7 飞机等级
+    assert transport_only["lodging"] is None
+
+
+def test_resolve_travel_standard_snapshot_normalizes_grade_variants():
+    # "p5" 小写、未标准化写法应被归一为 "P5"
+    snapshot = resolve_travel_standard_snapshot(
+        location="武汉",
+        employee_grade="p5",
+    )
+    assert snapshot["employee_grade"] == "P5"
+    assert snapshot["lodging"]["daily_cap"] == "480.00"
+
+
+def test_resolve_travel_standard_snapshot_handles_unknown_grade():
+    snapshot = resolve_travel_standard_snapshot(
+        location="武汉",
+        employee_grade="",
+    )
+    # 无职级时无法匹配住宿标准(需要职级档位);补助为占位说明,不计入 matched_any
+    assert snapshot["lodging"] is None
+    assert snapshot["matched_any"] is False
+    assert snapshot["allowance"] is not None  # 仍返回占位说明
+
+
+def test_execute_travel_standard_query_returns_succeeded_with_answer_markdown():
+    request = _build_request(location="武汉", employee_grade="P5")
+    response = execute_travel_standard_query(
+        executor=None,
+        request=request,
+        current_user=_build_current_user("P5"),
+        trace=[],
+    )
+    assert response.status == "succeeded"
+    assert response.action_type == "execute_travel_standard_query"
+    assert "差旅标准查询结果" in response.message
+    assert "480.00" in response.message  # 住宿标准
+    assert response.result_payload["matched"] is True
+    assert response.result_payload["standards"]["lodging"]["daily_cap"] == "480.00"
+
+
+def test_execute_travel_standard_query_falls_back_to_current_user_grade_when_field_missing():
+    request = _build_request(location="武汉", employee_grade="")
+    response = execute_travel_standard_query(
+        executor=None,
+        request=request,
+        current_user=_build_current_user("P5"),
+        trace=[],
+    )
+    assert response.status == "succeeded"
+    # 应回退到 current_user.grade = P5
+    assert response.result_payload["standards"]["employee_grade"] == "P5"
+
+
+def test_execute_travel_standard_query_returns_no_match_when_grade_and_city_unknown():
+    request = _build_request(
+        location="未知城市",
+        employee_grade="",
+        message="查差旅标准",
+    )
+    # ontology_fields 也没有 grade,current_user 也没有
+    response = execute_travel_standard_query(
+        executor=None,
+        request=request,
+        current_user=_build_current_user(""),
+        trace=[],
+    )
+    assert response.status == "succeeded"
+    assert response.result_payload["matched"] is False
+    assert "未能匹配" in response.message
+
+
+def test_build_travel_standard_query_steps_generates_single_executable_step():
+    task = StewardTask(
+        task_id="task_query_001",
+        task_type="query_travel_standard",
+        assigned_agent="policy_query_assistant",
+        title="差旅标准查询",
+        summary="查武汉住宿标准",
+        ontology_fields={"location": "武汉", "employee_grade": "P5"},
+    )
+    steps = build_travel_standard_query_steps(task)
+    assert len(steps) == 1
+    assert steps[0].action_type == "execute_travel_standard_query"
+    assert steps[0].requires_confirmation is False
+    assert steps[0].payload["ontology_fields"]["location"] == "武汉"