fix: remove unused imports in streamable-http E2E tests

Remove unused imports flagged by code review:
- createClient, listClients, listFeatureSetsBySpace,
  grantFeatureSetToClient from tauri-api
- waitForGateway from mcp-client

Signed-off-by: Myko <myko@mcpmux.com>

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

Author: its-mash

tests/e2e/specs/streamable-http.wdio.ts

@@ -21,17 +21,12 @@ import {
   enableServerV2,
   disableServerV2,
   listInstalledServers,
-  createClient,
-  listClients,
-  listFeatureSetsBySpace,
-  grantFeatureSetToClient,
   refreshRegistry,
   approveOAuthClient,
 } from '../helpers/tauri-api';
 import {
   registerOAuthClient,
   obtainAccessToken,
-  waitForGateway,
 } from '../helpers/mcp-client';
 import {
   triggerToolsChanged,