feat: 新增归档中心页面并完善知识库与报销查询能力

新增前端归档中心视图及相关工具函数，扩充知识库文档分类和
提取器支持多种格式，增强编排器报销查询的多维度检索，优
化本体规则和用户代理审核消息，前端完善报销创建和审批详
情交互细节，补充单元测试覆盖。

server/src/app/services/agent_conversations.py

@@ -93,6 +93,12 @@ class AgentConversationService:
             if existing_session_type != incoming_session_type:
                 normalized_id = ""
                 conversation = None
+        if conversation is not None and self._has_draft_claim_scope_conflict(
+            conversation,
+            incoming_draft_claim_id,
+        ):
+            normalized_id = ""
+            conversation = None
 
         if conversation is None:
             conversation = AgentConversation(
@@ -241,6 +247,10 @@ class AgentConversationService:
         history_limit: int = 8,
     ) -> dict[str, Any]:
         merged = dict(context_json or {})
+        incoming_draft_claim_id = self._resolve_draft_claim_id(merged)
+        if self._has_draft_claim_scope_conflict(conversation, incoming_draft_claim_id):
+            return merged
+
         state_json = dict(conversation.state_json or {})
         should_hydrate_review_flow = self._should_hydrate_review_flow_context(
             context_json=merged,
@@ -641,6 +651,26 @@ class AgentConversationService:
             ).strip()
         return ""
 
+    @staticmethod
+    def _resolve_conversation_draft_claim_id(conversation: AgentConversation) -> str:
+        state_json = dict(conversation.state_json or {})
+        return str(
+            conversation.draft_claim_id
+            or state_json.get("draft_claim_id")
+            or ""
+        ).strip()
+
+    @staticmethod
+    def _has_draft_claim_scope_conflict(
+        conversation: AgentConversation,
+        incoming_draft_claim_id: str | None,
+    ) -> bool:
+        incoming_claim_id = str(incoming_draft_claim_id or "").strip()
+        if not incoming_claim_id:
+            return False
+        existing_claim_id = AgentConversationService._resolve_conversation_draft_claim_id(conversation)
+        return bool(existing_claim_id and existing_claim_id != incoming_claim_id)
+
     @staticmethod
     def _merge_state_json(
         current_state: dict[str, Any] | None,