httpd: auto-redirect to change password page on mandatory password ch…

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Auto-Redirect to Change Password Page on Mandatory Password Change

Summary

This PR adds a focused improvement to the WebUI login flow:
when a user or admin is required to change their password, they are now
automatically redirected to the change password page immediately after
a successful login.

Note on Turkish locale: We have submitted the Turkish (tr) language
translation separately via Crowdin
as suggested. It is not included in this PR.

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Problem

When MustChangePassword (user) or RequirePasswordChange (admin) was set,
after a successful login the user was redirected to the normal landing page
(/web/client/files or /web/admin/users).
The checkAuthRequirements middleware would then block every subsequent
request with a Forbidden error, leaving the user with no visible path
forward and no indication of what they needed to do.

Solution

Added an explicit redirect to the change password page immediately after
login, before the normal landing page redirect.

loginUser — internal/httpd/server.go

if user.MustChangePassword() {
    http.Redirect(w, r, webChangeClientPwdPath, http.StatusFound)
    return
}