v0.4.1

• Added AGENT_DIR-based generated install and helper commands.
• Fixed installer and helper edge cases discovered during real host bring-up.
• Added host inventory CRUD through both the API and the web UI.
• Added a published-image quick-start compose file with persistent site data.
• Added a dedicated local development guide for the repo workflow.
• Documented Proxmox helper presets and the AppArmor workaround for compose-mode agents on locked-down Docker hosts.