fix: fallback to github login if name is not available

[GreenmeisterDavid]

Pull Request: Fallback Handling for Missing GitHub User Info and Minor TypeScript Fix

This PR solves Issue #22 by introducing a fallback mechanism for GitHub user names:

• Fallback Logic:
  When no user name is provided (null), the system will:
  1. Fall back to the GitHub user's login
  2. If no login is available, fall back to the user's email prefix (everything before the @ symbol)

// Fallback to the user's login or email name if the name is not available
const userName = oauthUser.name || oauthUser.login || oauthUser.email.split('@')[0]

// If the user is not signed in and no user exists with that GitHub ID or email address, create a new user
const createdUser = await createUser({
  name: userName as string,
})

---

Additionally, this PR fixes a minor TypeScript issue that occurs during npx nuxi typecheck by ensuring a pathname exists in server/routes/images/[...pathname].get.ts:

export default eventHandler(async (event) => {
  const { pathname } = getRouterParams(event)

  if (!pathname) {
    return createError({
      statusCode: 404,
      statusMessage: 'Not Found',
    })
  }

  return hubBlob().serve(event, pathname)
})

[Barbapapazes]

Hey 👋,

Thanks for this fix! 💜