feat(ha): implement clan vars and fully encrypt all HA secrets

- Run sync-host-keys.sh for proxmox-ha-server-{1,2}: generates SSH host
  key pairs in vars/per-machine/, registers age anchors in .sops.yaml,
  adds both hosts as recipients for common.yaml, ha-corosync-authkey,
  and per-host secrets/keytab files
- Re-encrypt secrets/common.yaml with both new host keys
- Convert all stub secrets to real sops-encrypted files:
    secrets/ha-server-{1,2}.yaml    (YAML, beszel-token = PLACEHOLDER)
    secrets/ha-server-{1,2}.keytab  (binary, stub text encrypted)
    secrets/ha-corosync-authkey      (binary, stub text encrypted)
- Add scripts/ha/deploy.sh: full lifecycle script (bridge setup, VM
  creation, DRBD disk + storage NIC attachment, boot wait, cluster-init,
  acceptance tests, --destroy)

Bootstrap order (operator runs these before first deploy):
  1. bash scripts/ha/deploy.sh            # deploys, tests
  # Post-deploy secret replacement:
  2. sops secrets/ha-server-{1,2}.yaml   (set real beszel-token)
  3. bash scripts/ipa/create-nixos-ipa-host-account.sh --ip 192.168.2.228 ha-server-1
  4. bash scripts/ipa/create-nixos-ipa-host-account.sh --ip 192.168.2.227 ha-server-2
  5. Set services.beszel.agent.environment.KEY in host.nix after hub pairing
  6. nixos-rebuild switch on both nodes to pick up real secrets

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HaH1cSGvhogRP5ExoF6nD8

vars/per-machine/proxmox-ha-server-2/openssh/ssh_host_ed25519_key/secret

@@ -0,0 +1,14 @@
+{
+	"data": "ENC[AES256_GCM,data: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,iv:H4BonLmf3VoW2S9+IUE+SzPb0qiWHuNuGpVIUgUYScs=,tag:5+bq7vC81DMmOk4jn3u8lg==,type:str]",
+	"sops": {
+		"age": [
+			{
+				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBrQitsaDlqTmlYM2RvR1Ew\nb3NzZTJzR3F2bjM5NHhsa3dCUzZ4TW1pa3pBCkxIeEJtbWdaUFMwMkFyRHpCZ1Bl\nbmM5dGV3b3BDcDEwVlJ4UWV5RFNvRkUKLS0tIFRDd0U3dHBHb0Y3WDhNV3hkd2Ew\nclRDVEZHYjZUSzNVZkFjWGt3SGVQTlUKOULuXiYD9k2uVUmhuC15Kgezrd69rc9P\n7SocPa8kBliffP9IuxxW2S/hPbK8rqEx/sh/Km85ZIi4pG0AUQJ3fA==\n-----END AGE ENCRYPTED FILE-----\n",
+				"recipient": "age1njap586hc0q43kr03g6c8eqhdsmk8zcafkl3f83xwlc2gqhlmfgs4tmwad"
+			}
+		],
+		"lastmodified": "2026-07-28T06:45:10Z",
+		"mac": "ENC[AES256_GCM,data:ZnsqhgELqEdNzlTKJx2+xzcZRMNGTme/0a+PVvpbUv5IApimtif0zkTEC1LJsyLPut3MmO3QGprVlb8ihoRdm/IVvLaQonc36f6vN5cxrpQadru/RWEjLbnge1E8VkN/PVvHqRfLyIOPSq6wtGjAPaC/iHW1scBi50pWr0XO628=,iv:FlqAL1It6JuvoBhZotHWdSz17nckBf2rXnwovl6ZJBA=,tag:tNwcaL1sJakXtgejsB/Sbg==,type:str]",
+		"version": "3.13.3"
+	}
+}