feat(ckchat): 添加搜索关键词状态及相关方法

在CkChatState接口中添加searchKeyword字段用于存储搜索关键词，并新增setSearchKeyword和clearSearchKeyword方法用于管理搜索状态

Cunkebao/src/store/module/ckchat/ckchat.data.ts

@@ -33,6 +33,7 @@ export interface CkUserInfo {
 export interface CkChatState {
   userInfo: CkUserInfo | null;
   isLoggedIn: boolean;
+  searchKeyword: string;
   contractList: ContractData[];
   chatSessions: any[];
   kfUserList: KfUserListData[];
@@ -42,6 +43,8 @@ export interface CkChatState {
   newContractList: ContactGroupByLabel[];
   getContractList: () => ContractData[];
   getNewContractList: () => ContactGroupByLabel[];
+  setSearchKeyword: (keyword: string) => void;
+  clearSearchKeyword: () => void;
   asyncKfSelected: (data: number) => void;
   asyncWeChatGroup: (data: weChatGroup[]) => void;
   asyncCountLables: (data: ContactGroupByLabel[]) => void;