feat: 报销审批流重构与管家计划全链路贯通

- 重构报销状态注册表、审批流路由与平台风险标记
- 完善管家意图规划器与模型计划构建器全链路
- 新增 OCR Worker 脚本、数据库会话管理与通知状态
- 优化文档中心、日志视图、预算中心与员工管理交互
- 增强工作台摘要、图标资源与全局主题样式
- 补充审批路由、状态注册、OCR 服务与管家规划器测试覆盖

server/src/app/services/receipt_folder.py

@@ -336,11 +336,11 @@ class ReceiptFolderService:
         shutil.rmtree(receipt_dir)
         return ReceiptFolderDeleteResponse(message="票据已删除。", receipt_id=receipt_id)
 
-    def delete_receipts_for_claim(self, claim_id: str) -> int:
+    def unlink_receipts_for_claim(self, claim_id: str) -> int:
         normalized_claim_id = str(claim_id or "").strip()
         if not normalized_claim_id:
             return 0
-        deleted_count = 0
+        unlinked_count = 0
         self.root.mkdir(parents=True, exist_ok=True)
         for meta_path in list(self.root.glob("*/*/meta.json")):
             try:
@@ -349,9 +349,18 @@ class ReceiptFolderService:
                 continue
             if str(meta.get("linked_claim_id") or "").strip() != normalized_claim_id:
                 continue
-            shutil.rmtree(meta_path.parent, ignore_errors=True)
-            deleted_count += 1
-        return deleted_count
+            meta["status"] = "unlinked"
+            meta["linked_claim_id"] = ""
+            meta["linked_claim_no"] = ""
+            meta["linked_item_id"] = ""
+            meta["linked_at"] = ""
+            meta["updated_at"] = datetime.now(UTC).isoformat()
+            self._write_meta(meta_path.parent, meta)
+            unlinked_count += 1
+        return unlinked_count
+
+    def delete_receipts_for_claim(self, claim_id: str) -> int:
+        return self.unlink_receipts_for_claim(claim_id)
 
     def resolve_source(self, receipt_id: str, current_user: CurrentUserContext) -> tuple[Path, str, str]:
         meta = self._read_receipt_meta(receipt_id, current_user)