feat(core): mcp server setting (#13630)

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

* **New Features**
* MCP Server integration available in cloud workspaces with a dedicated
settings panel.
* Manage personal access tokens: generate/revoke tokens and view
revealed token.
  * One-click copy of a prefilled server configuration JSON.
  * New query to fetch revealed access tokens.

* **Improvements**
  * Integration list adapts to workspace type (cloud vs. local).
* More reliable token refresh with clearer loading, error and
revalidation states.

* **Localization**
* Added “Copied to clipboard” message and MCP Server name/description
translations.

* **Chores**
  * Updated icon dependency across many packages.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/models/access-token.ts

@@ -15,13 +15,14 @@ export class AccessTokenModel extends BaseModel {
     super();
   }
 
-  async list(userId: string) {
+  async list(userId: string, revealed: boolean = false) {
     return await this.db.accessToken.findMany({
       select: {
         id: true,
         name: true,
         createdAt: true,
         expiresAt: true,
+        token: revealed,
       },
       where: {
         userId,