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/src/app/services/steward_action_executor.py

@@ -15,6 +15,11 @@ from app.schemas.steward import (
 from app.schemas.user_agent import UserAgentRequest
 from app.services.attachment_association_jobs import AttachmentAssociationJobRunner
 from app.services.expense_claims import ExpenseClaimService
+from app.services.steward_intent_registry import (
+    all_noop_actions,
+    all_side_effect_actions,
+    resolve_intent_by_action,
+)
 from app.services.user_agent import UserAgentService
 from app.services.user_agent_application_dates import resolve_application_days_from_time_range
 
@@ -31,8 +36,8 @@ SUPPORTED_ACTIONS = {
     "link_existing_application",
     "associate_attachments",
 }
-APPLICATION_SIDE_EFFECT_ACTIONS = {"save_application_draft", "submit_application"}
-REIMBURSEMENT_SIDE_EFFECT_ACTIONS = {"create_reimbursement_draft", "link_existing_application"}
+APPLICATION_SIDE_EFFECT_ACTIONS = {"save_application_draft", "submit_application", "run_duplicate_precheck"}
+REIMBURSEMENT_SIDE_EFFECT_ACTIONS = {"create_reimbursement_draft", "link_existing_application", "associate_attachments"}
 NOOP_ACTIONS = {
     "fill_application_fields",
     "build_application_preview",
@@ -83,7 +88,8 @@ class StewardActionExecutor:
     ) -> StewardActionExecuteResponse:
         action_type = self._normalize_action_type(request.action_type)
         trace = [self._trace("received", action_type=action_type, plan_id=request.plan_id)]
-        if action_type not in SUPPORTED_ACTIONS:
+        supported = SUPPORTED_ACTIONS | all_side_effect_actions() | all_noop_actions()
+        if action_type not in supported:
             return self._blocked(
                 action_type,
                 f"不支持的小财管家动作：{action_type or '空动作'}。",
@@ -91,7 +97,8 @@ class StewardActionExecutor:
             )
 
         task = request.task
-        if task is None and action_type not in NOOP_ACTIONS:
+        noop_actions = NOOP_ACTIONS | all_noop_actions()
+        if task is None and action_type not in noop_actions:
             return self._blocked(
                 action_type,
                 "动作缺少任务快照，无法安全执行。",
@@ -107,7 +114,7 @@ class StewardActionExecutor:
                 trace=[*trace, self._trace("blocked", reason="missing_fields")],
             )
 
-        if action_type in NOOP_ACTIONS:
+        if action_type in noop_actions:
             return StewardActionExecuteResponse(
                 action_type=action_type,
                 status="succeeded",
@@ -118,6 +125,13 @@ class StewardActionExecutor:
                 },
                 trace=[*trace, self._trace("completed", mode="noop")],
             )
+
+        # 优先走注册表:查到 action 所属意图的 executor 即委托执行
+        intent = resolve_intent_by_action(action_type)
+        if intent is not None and intent.executor is not None:
+            return intent.executor(self, request, current_user, trace)
+
+        # 兼容回退:注册表未命中时按旧逻辑分发
         if action_type == "run_duplicate_precheck":
             return self._run_duplicate_precheck(request, current_user, trace)
         if action_type in APPLICATION_SIDE_EFFECT_ACTIONS:
@@ -133,6 +147,30 @@ class StewardActionExecutor:
             trace=[*trace, self._trace("blocked", reason="unwired_action")],
         )
 
+    def _dispatch_application_action(
+        self,
+        request: StewardActionExecuteRequest,
+        current_user: CurrentUserContext,
+        trace: list[dict[str, Any]],
+    ) -> StewardActionExecuteResponse:
+        """registry 入口:分发申请类副作用动作。"""
+        action_type = self._normalize_action_type(request.action_type)
+        if action_type == "run_duplicate_precheck":
+            return self._run_duplicate_precheck(request, current_user, trace)
+        return self._execute_application_action(request, current_user, action_type, trace)
+
+    def _dispatch_reimbursement_action(
+        self,
+        request: StewardActionExecuteRequest,
+        current_user: CurrentUserContext,
+        trace: list[dict[str, Any]],
+    ) -> StewardActionExecuteResponse:
+        """registry 入口:分发报销类副作用动作。"""
+        action_type = self._normalize_action_type(request.action_type)
+        if action_type == "associate_attachments":
+            return self._execute_associate_attachments_action(request, current_user, trace)
+        return self._execute_reimbursement_action(request, current_user, action_type, trace)
+
     def _run_duplicate_precheck(
         self,
         request: StewardActionExecuteRequest,