feat: add systemd user service + slow down tab blink animations

- Add scripts/claudeman-web.service: respawning systemd user service
  for `claudeman web --https` (Restart=always, RestartSec=5)
- Slow tab blink animations: red 1s→2.5s, yellow 1.5s→3.5s
  with ease-in-out and reduced opacity for less aggressive feel

Install: symlink to ~/.config/systemd/user/, enable, start
Linger: loginctl enable-linger keeps it running after logout

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/claudeman-web.service

@@ -0,0 +1,23 @@
+[Unit]
+Description=Claudeman Web Server (HTTPS)
+After=network.target
+
+[Service]
+Type=simple
+WorkingDirectory=/home/arkon/default/claudeman
+ExecStart=/usr/bin/node dist/index.js web --https
+Restart=always
+RestartSec=5
+Environment=NODE_ENV=production
+Environment=HOME=/home/arkon
+
+# Logging
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=claudeman
+
+# Resource limits
+LimitNOFILE=65536
+
+[Install]
+WantedBy=default.target