fix: block server owner from leaving without transferring ownership (#178)

[yashrajpurohit7]

Fixes #178

The leave_server endpoint had no role check - server owners
could leave just like regular members, making the server
permanently ownerless.

What I changed:

Added a role check before the leave logic runs. It queries the
user's servers array to find their role for that specific server.

Three cases are now handled:

• Regular member proceeds with normal leave as before
• Owner with other members blocked with 403, asked to
  transfer ownership first
• Solo owner (only member) allowed to leave, server is
  soft deleted automatically

The role and member count data was already in the DB
it just wasn't being checked anywhere in this route.

Files changed :

• server/routes/servers.js

[vercel]

@yashrajpurohit7 is attempting to deploy a commit to the Sunil Kumar's projects Team on Vercel.

A member of the Team first needs to authorize it.

[0rigin-c0de]

@yashrajpurohit7 Can you please resolve merge conflicts
If you need any help let me know