feat: Add recent performance stability stats (matches/days) to player profile

web/auth.py

@@ -0,0 +1,11 @@
+from functools import wraps
+from flask import session, redirect, url_for, flash
+
+def admin_required(f):
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        if session.get('is_admin'):
+            return f(*args, **kwargs)
+        flash('Admin access required', 'warning')
+        return redirect(url_for('admin.login'))
+    return decorated_function