Initial Homepage dashboard configuration

Services, widgets, layout and settings for the homelab dashboard.
Secrets are externalized via {{HOMEPAGE_VAR_*}} placeholders and
supplied through a local .env file (not committed).

proxmox.yaml

@@ -0,0 +1,5 @@
+---
+pve:
+  url: https://192.168.30.215:8006
+  token: "{{HOMEPAGE_VAR_PROXMOX_USERNAME}}"
+  secret: "{{HOMEPAGE_VAR_PROXMOX_PASSWORD}}"