Add panel-api and panelctl scripts for container management

Co-authored-by: Copilot <copilot@github.com>

README.md

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+# panelctl quickstart
+
+This repository now includes a small helper command named panelctl for Phase 2.
+
+Base directory:
+- /home/reudy/containers
+
+Generated structure:
+- /home/reudy/containers/stacks/<app>/compose.yaml
+- /home/reudy/containers/volumes/<app>/data
+- /home/reudy/containers/routes/<app>.caddy
+- /home/reudy/containers/state/apps/<app>.env
+
+Quick workflow:
+1. Create a new app definition:
+   panelctl init whoami whoami.srazka.com 18080 true
+2. Deploy it with Podman compose:
+   panelctl deploy whoami
+3. If deploy says caddy reload needs root:
+   sudo systemctl reload caddy
+4. List apps:
+   panelctl list
+5. Inspect one app:
+   panelctl show whoami
+6. Remove app but keep data:
+   panelctl remove whoami --keep-volumes
+
+Notes:
+- The default compose file uses traefik/whoami for smoke testing.
+- Edit each generated compose.yaml before production use.
+- App names must be lowercase slugs.
+
+API service:
+- Nix now runs panel-api as a systemd service on 127.0.0.1:9911.
+- Caddy proxies https://panel.srazka.com to panel-api with your existing forward_auth pattern.
+- Open https://panel.srazka.com for the web UI.
+- API docs are in panel/API.md.