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_intent_agent.py

@@ -68,3 +68,33 @@ def test_steward_intent_agent_uses_ten_second_timeout_and_three_attempts() -> No
     assert runtime_chat.kwargs["timeout_seconds"] == 10
     assert runtime_chat.kwargs["max_attempts"] == 3
     assert runtime_chat.kwargs["use_failure_cooldown"] is False
+
+
+def test_steward_intent_tool_schema_includes_query_task_type_from_registry() -> None:
+    """function call schema 的 task_type enum 应从注册表动态生成,包含查询意图。"""
+    from app.services import steward_intent_bootstrap  # noqa: F401  触发意图注册
+
+    schema = StewardIntentAgent._build_intent_tool_schema(
+        ["expense_type", "time_range", "location", "reason", "transport_mode"]
+    )
+    task_schema = schema["function"]["parameters"]["properties"]["tasks"]["items"]
+    task_type_enum = task_schema["properties"]["task_type"]["enum"]
+
+    assert "expense_application" in task_type_enum
+    assert "reimbursement" in task_type_enum
+    assert "query_travel_standard" in task_type_enum
+
+
+def test_steward_intent_system_prompt_mentions_query_intent_guidance() -> None:
+    """system prompt 应包含查询意图的识别指引,避免被误识别为申请。"""
+    from app.services import steward_intent_bootstrap  # noqa: F401  触发意图注册
+
+    messages = StewardIntentAgent._build_messages(
+        StewardPlanRequest(message="武汉出差标准是多少"),
+        base_date=__import__("datetime").date(2026, 6, 24),
+        canonical_fields=["location", "employee_grade"],
+    )
+    system_prompt = messages[0]["content"]
+    assert "query_travel_standard" in system_prompt
+    assert "差旅" in system_prompt
+    assert "住宿标准" in system_prompt