Refactor: Remove unused API code (#13978)

### What problem does this PR solve?

Refactor: Remove unused API code

### Type of change


- [x] New Feature (non-breaking change which adds functionality)



<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Style**
* Updated table header styling in dataset settings by removing a
hard-coded background color class, allowing the header to use default or
inherited component styling instead.

* **Refactor**
* Removed token management endpoints from the API service. Token
creation, listing, and removal functions are no longer available.
  * Removed the statistics data endpoint from available API routes.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

web/src/pages/dataset/dataset-setting/tag-table/index.tsx

@@ -222,7 +222,7 @@ export function TagTable() {
           )}
         </div>
         <Table rootClassName="rounded-none border max-h-80 overflow-y-auto">
-          <TableHeader className="bg-[#39393b]">
+          <TableHeader>
             {table.getHeaderGroups().map((headerGroup) => (
               <TableRow key={headerGroup.id}>
                 {headerGroup.headers.map((header) => {

web/src/services/next-chat-service.ts

@@ -16,10 +16,6 @@ const {
   removeSessions,
   deleteMessage,
   thumbup,
-  createToken,
-  listToken,
-  removeToken,
-  getStats,
   chatsTts,
   ask,
   chatsMindmap,
@@ -85,22 +81,6 @@ const methods = {
     url: thumbup,
     method: 'put',
   },
-  createToken: {
-    url: createToken,
-    method: 'post',
-  },
-  listToken: {
-    url: listToken,
-    method: 'get',
-  },
-  removeToken: {
-    url: removeToken,
-    method: 'post',
-  },
-  getStats: {
-    url: getStats,
-    method: 'get',
-  },
   chatsTts: {
     url: chatsTts,
     method: 'post',

web/src/utils/api.ts

@@ -150,11 +150,6 @@ export default {
   ask: `${restAPIv1}/chats/ask`,
   chatsMindmap: `${restAPIv1}/chats/mindmap`,
   chatsRelatedQuestions: `${restAPIv1}/chats/related_questions`,
-  // chat for external
-  createToken: `${webAPI}/api/new_token`,
-  listToken: `${webAPI}/api/token_list`,
-  removeToken: `${webAPI}/api/rm`,
-  getStats: `${webAPI}/api/stats`,
 
   // next chat
   fetchExternalChatInfo: (id: string) => `${restAPIv1}/chatbots/${id}/info`,