feat: add Proxmox LXC skill for container provisioning

- New /proxmox-lxc skill: create, configure, and manage LXC containers
  on Proxmox servers via API and SSH
- Includes Node.js/Docker base setup, Nginx reverse proxy templates
- Integrated into /ssh-deploy and /workflow orchestrator
- New workflow: /workflow provision for full LXC + deploy pipeline
- Added PVE config section to project.env.template

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

config/project.env.template

@@ -28,6 +28,19 @@ SSH_USER=deploy
 SSH_KEY_PATH=~/.ssh/id_rsa
 DEPLOY_PATH=/var/www/app
 
+# -------------------------------------------
+# PROXMOX (LXC-Container)
+# -------------------------------------------
+PVE_HOST=
+PVE_PORT=8006
+PVE_USER=root@pam
+PVE_TOKEN_ID=
+PVE_TOKEN_SECRET=
+PVE_NODE=pve
+PVE_STORAGE=local-lvm
+LXC_TEMPLATE=debian-12-standard
+# Token erstellen: Datacenter > Permissions > API Tokens
+
 # -------------------------------------------
 # TECH-STACK
 # -------------------------------------------