refactor(ckbox): 统一将contact重命名为contract

将代码中所有的contact变量和类名统一改为contract，包括API路径、组件属性、CSS类名等
更新相关路由配置和文档中的API接口说明

Cunkebao/src/store/module/ckchat.ts

@@ -120,6 +120,11 @@ export const getCkTenantId = () => useCkChatStore.getState().getTenantId();
 export const getCkAccountName = () =>
   useCkChatStore.getState().getAccountName();
 export const getCkTenantName = () => useCkChatStore.getState().getTenantName();
-export const getChatSessions = () => useCkChatStore.getState().chatSessions;
+export const getChatSessions = () =>
+  useCkChatStore.getState().getChatSessions();
 export const addChatSession = (session: ContractData | GroupData) =>
   useCkChatStore.getState().addChatSession(session);
+export const updateChatSession = (session: ContractData | GroupData) =>
+  useCkChatStore.getState().updateChatSession(session);
+export const deleteChatSession = (sessionId: string) =>
+  useCkChatStore.getState().deleteChatSession(sessionId);