feat: decommission server.sweet.home

Removes all flake artifacts for the retired NFS/ZFS file server:
- flake.nix: drop linode-server, proxmox-server, lxc-server targets
- hosts/server/: delete host identity
- modules/build-types/server.nix: delete build type (ZFS pool + NFS exports)
- vars/per-machine/{linode,lxc,proxmox}-server/: delete clan vars
- secrets/server.keytab: delete IPA keytab
- .sops.yaml: remove server key anchors, strip from common.yaml recipients,
  delete server.yaml and server.keytab creation rules
- variables.nix: remove serverIp, serverStorageIp (nfsServerHost/storageRoot
  retained — pxe-boot/mount-pxe-images.nix still references them)
- docs: mark server decommissioned in ip-addressing.md

Docker NFS mounts already pointed at nfs.storage.home (previous commit).
VM destruction and DNS cleanup (server.sweet.home, server.storage.home
A/PTR records) to follow once the VM is confirmed stopped.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J8djTWdXVzXZc99iujU6T2

secrets/server.keytab

@@ -1,26 +0,0 @@
-{
-	"data": "ENC[AES256_GCM,data:aqlMnoVkGtH9z3fJRweeC0OYf7LGqJU2sWA9Q25dKK6NuNyJd4BvjPtpfeg/WhVtJsaOtcbwVm4WAhVK9FARE8g8j+vmq0f6BAU4s6mx0ZIhl+mP+/hIpt//LOdd+9YezelJxdpzUyZbdAngU99rsTluLRe2XmZ7Fquxd8yH/OHenSDY6dizp9+5jfEi8EU+EmuXvuWMPY59xnlnqYNPfSFxs43/pS402LzJoJ5H+cBPprddkUBVzy4cBQvMnrRFUSjnqp74ovZkfIWFqDWQ5YgSU2PjatBg18oulZ7wNRhQ6OLqj6gsu+xrMjNFwnp7rMlA3X//hIidxTkVcYITycXd8KzuMIaofUpnwoyT34fy6+H35/39iiEyG4LRTrOOKRDzXkY2rhJUxFSZ8GlhNhMd0RlkmLngVYrtjsswJ9meIwoAFLPYt7BC61PJf0TXdtk=,iv:mCA819J9LpAOj8QxFAkrHI9wFJIy8qVxv31D6IwWFnk=,tag:qqMtM0eyHbQEyl6ND/wf7g==,type:str]",
-	"sops": {
-		"age": [
-			{
-				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBOZVpRYmNMQ1E4ZlFXMDVq\nbW1FcnYzWTBHQmdhSjlsZUtZK3dzNUZjY1FvCkV4VXU4MTcwNVZoZUpVVS9JeHE5\nbGk3UzE3YmpZQ1JISHV0RHJqSG9ZNXcKLS0tIHhBdnIvMjJkeWlVRE9Fb0FhWjNX\nUjBVWDltK2w0akkwOTJaTGNSWWNrRXMKqZRNnHiXvn1QBoSGdABp7vOqNlsEN6Xr\nDp3NByXow6PuRuWvQXHzd+WC+ADkwNaaiT6TUrbZcd/Pl8Ges9kcZg==\n-----END AGE ENCRYPTED FILE-----\n",
-				"recipient": "age1njap586hc0q43kr03g6c8eqhdsmk8zcafkl3f83xwlc2gqhlmfgs4tmwad"
-			},
-			{
-				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSA2VFBxc2ZMUFp0YkJhVFhW\nc0ZNbnJUcGtkT1VLR2YrVGhRRFVTZFlyZXlJCmVnblNBNGxIdHh4Q0IweWR1b0dq\nRWFyOURuWkdkRE1RTnJRMEpXdk9HaUUKLS0tIFhKV3FoWW1zRk1pMlhuWWlhV2E5\nQzJTRHAyc0JtSjd2NHlJODZVbndaVDgKFA4565X/4FqNq/fZDZTg81/55hZi4c7b\nTti2AnyE3OcY/kurXJFHRinVMqURQf1fx9MxqUYRitiCz4qe5zFF+A==\n-----END AGE ENCRYPTED FILE-----\n",
-				"recipient": "age1sweerhrga9yf8x6sv0apz4ed4g48rnlcq34rpv20t0rcelwgpgeqwvndzz"
-			},
-			{
-				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSAwRWlKTFNocnBRN01pZ0hm\na3pyRUkxMWM3dE1iTkZZcGRYUFcyb1RDb2h3Ckt4blpGZHBjcnZ4SVE5UnF4cmY4\nWW0rZG5wUkZINVk5a2lmSzN2L3JJY1kKLS0tIExpWGlBRFZJVGpGbFhxRE5ZYjBo\nQVliTlFIZ1U5dE9xbDhHMUtxenpBSm8KY6sIFEfK8p+70IXsC4Jwb9Lm/pd9+V6K\n4JAzGrpA6mAuIwwSNnbdcA5j8FmBhCpK6nLBWmFhGm9Y+MRTaM7Jrw==\n-----END AGE ENCRYPTED FILE-----\n",
-				"recipient": "age1nruncs4l0ufk7yuc4des8p99c0alfndl0lhsws8tycl5pplfp56s30af5f"
-			},
-			{
-				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBoV0pIUXlyOFFTUHVTdllu\neG10VENOYWl5Wk0ycnpLUytTbnlrQ25pMkFRCnhyRU5xWW9vQXJJOHdFMGZqMkR1\nSktqT3lOdVVPRUN4YTlveGp0NXpqd0kKLS0tIGRaTktra0ZtSVpzSHBrY3VSSUph\nRVRZOSsxTTNmMmltMlJnVy9oT2VEWU0Krxf49B1BsrWn05fqg+cZ0k0PtfJJNfn0\nUL44RUWXWbK2igQHaIct9DfYe7DEonBJeROuxDYm8g7yNOv15S+P4Q==\n-----END AGE ENCRYPTED FILE-----\n",
-				"recipient": "age1529taqdwr6t0w7cvzmty0d5y5593wffl0krt48j6uc4u39k56g2qf6ywtp"
-			}
-		],
-		"lastmodified": "2026-07-28T01:44:26Z",
-		"mac": "ENC[AES256_GCM,data:eyOSn03dzHSgkshPzLVwc95382eEFaDQarHs9l83dtcsb1Ui9CjkKipl2DVSUb6bdMUH1qKYmXqJhwFnAZbFZFjT4VTKtutNtM+OkhVXfT+fJs+1+u7k+ZUYFL9HuxKA6AWpwX3eJ8vmJDJZaAayJbm4PRzOyJywvKeneQqdUS0=,iv:QRKltR4qzVofo/Elt2Us/lrHlD7BenX605X31x+Ng78=,tag:SZ97CcfgMJeu3yqNk8Y/cA==,type:str]",
-		"version": "3.13.2"
-	}
-}