Fix tool and prompt description update not calling API

The issue was that toolService.ts and promptService.ts were setting
Authorization: Bearer header manually, but the backend expects the
x-auth-token header. The auth interceptor already handles adding
x-auth-token automatically, so the fix is to remove the manual header
and let the interceptor do its job.

Co-authored-by: samanhappy <2755122+samanhappy@users.noreply.github.com>

mcp_settings.json

@@ -12,7 +12,7 @@
       "tools": {
         "amap-maps_regeocode": {
           "enabled": true,
-          "description": "My custom description"
+          "description": "Updated via UI test"
         }
       }
     },