Make /logs strictly admin-only, never accessible in demo mode

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

llm_team_ui.py

@@ -319,8 +319,9 @@ def demo_set_allowlist():
 
 
 @app.route("/logs")
-@admin_required
 def logs_page():
+    if not is_admin():
+        return redirect("/login")
     try:
         with open("/var/www/html/report.html") as f:
             return f.read()