Stripped all CSRF token generation, injection, and validation since it
breaks behind Apache reverse proxy. Removed handlers/csrf.go, stripped
CSRFToken from PageData, removed validateCSRFToken from all POST handlers,
and cleaned up hidden inputs and JS CSRF references.
Added self-service password change at /password/ with current-password
verification and bcrypt update. New Password link in navbar.
Extended admin panel with user management: lists all users with join dates
and allows admins to delete other users (self-deletion blocked). Added
GetAllUsers() and DeleteUser() to models.
Joca