feat(steward): off_topic 场景细分与引导回复

- 将业务无关输入细分为 greeting / meaningless / off_business 三类场景
- 新增 StewardOffTopicAgent，用 function calling 生成管家语气引导回复
- steward endpoint 与 user_agent_application 串联 off_topic 引导话术
- 补充 planner 与 user agent 的 off_topic 覆盖测试

server/src/app/services/user_agent_application.py

@@ -86,6 +86,25 @@ APPLICATION_TRANSPORT_KEYWORDS = {
     "火车": ("火车", "高铁", "动车", "铁路", "列车"),
     "轮船": ("轮船", "船", "客轮", "邮轮", "坐船"),
 }
+APPLICATION_TYPE_DISPLAY_LABELS = {
+    "travel": "差旅费用申请",
+    "travel_application": "差旅费用申请",
+    "expense_application": "费用申请",
+    "application": "费用申请",
+    "transport": "交通费用申请",
+    "transportation": "交通费用申请",
+    "traffic": "交通费用申请",
+    "hotel": "住宿费用申请",
+    "accommodation": "住宿费用申请",
+    "meeting": "会务费用申请",
+    "conference": "会务费用申请",
+    "purchase": "采购费用申请",
+    "procurement": "采购费用申请",
+    "training": "培训费用申请",
+    "business_entertainment": "业务招待申请",
+    "entertainment": "业务招待申请",
+    "office": "办公费用申请",
+}
 APPLICATION_REASON_VERBS = (
     "支撑",
     "支持",
@@ -316,6 +335,7 @@ class UserAgentApplicationMixin:
             if value:
                 facts[key] = value
 
+        facts["application_type"] = self._normalize_application_type_label(facts.get("application_type", ""))
         context_json = payload.context_json or {}
         context_time = self._resolve_application_time_from_context(context_json)
         if context_time and self._should_prefer_context_application_time(facts.get("time", ""), context_time):
@@ -476,7 +496,9 @@ class UserAgentApplicationMixin:
 
         reason = UserAgentApplicationMixin._cleanup_application_reason_candidate(pick("reason"))
         return {
-            "application_type": pick("applicationType", "application_type"),
+            "application_type": UserAgentApplicationMixin._normalize_application_type_label(
+                pick("applicationType", "application_type")
+            ),
             "time": pick("time", "timeRange", "time_range"),
             "location": pick("location"),
             "reason": reason,
@@ -842,11 +864,40 @@ class UserAgentApplicationMixin:
 
     @staticmethod
     def _resolve_application_type_from_text(message: str) -> str:
-        return UserAgentApplicationMixin._resolve_application_labeled_value(
-            message,
-            ("申请类型", "费用类型"),
+        return UserAgentApplicationMixin._normalize_application_type_label(
+            UserAgentApplicationMixin._resolve_application_labeled_value(
+                message,
+                ("申请类型", "费用类型"),
+            )
         )
 
+    @staticmethod
+    def _normalize_application_type_label(value: object, fallback: str = "") -> str:
+        raw_value = str(value or "").strip()
+        if not raw_value:
+            return str(fallback or "").strip()
+
+        normalized_key = raw_value.lower()
+        if normalized_key in APPLICATION_TYPE_DISPLAY_LABELS:
+            return APPLICATION_TYPE_DISPLAY_LABELS[normalized_key]
+        if re.fullmatch(r"(差旅费|差旅|出差)", raw_value):
+            return "差旅费用申请"
+        if re.fullmatch(r"(交通费|交通)", raw_value):
+            return "交通费用申请"
+        if re.fullmatch(r"(住宿费|住宿|酒店)", raw_value):
+            return "住宿费用申请"
+        if re.fullmatch(r"(会务|会议|会务费)", raw_value):
+            return "会务费用申请"
+        if re.fullmatch(r"(采购|采购费|办公用品)", raw_value):
+            return "采购费用申请"
+        if raw_value.endswith("费用申请") or raw_value.endswith("申请"):
+            return raw_value
+        if raw_value.endswith("费用"):
+            return f"{raw_value}申请"
+        if raw_value.endswith("费"):
+            return f"{raw_value[:-1]}费用申请"
+        return raw_value
+
     @staticmethod
     def _resolve_application_missing_slots(payload: UserAgentRequest) -> list[str]:
         return [