clanService/phonebox-global: decentralized phone network over yggdrasil

New service alongside phonebox. Boxes get a random 6 digit number
(100000-999999) signed by the machine's yggdrasil key. A serf gossip
cluster on yggdrasil port 7946 exchanges the signed records;
phonebox-sync verifies key -> address derivation and the signature and
writes the number -> address map to /run/phonebox/numbers for the
asterisk dialplan. Any yggdrasil node running the service can reach any
other; clan-core's ygg-input filter is opened for SIP, RTP and gossip.

Includes a two-node VM test proving directory convergence and a call
over yggdrasil. The existing phonebox service is untouched.

modules/clan/phonebox-global/tests/vm/vars/per-machine/nodeA/yggdrasil/address/value

@@ -0,0 +1 @@
+200:61ae:8864:fba2:27c:d040:aacc:82d

modules/clan/phonebox-global/tests/vm/vars/per-machine/nodeA/yggdrasil/privateKey/machines/nodeA

@@ -0,0 +1 @@
+../../../../../../sops/machines/nodeA

modules/clan/phonebox-global/tests/vm/vars/per-machine/nodeA/yggdrasil/privateKey/secret

@@ -0,0 +1,18 @@
+{
+	"data": "ENC[AES256_GCM,data:hR33SvxgsU+hZnvF2hoQxE7n0IB6kLC9MgK0wS0NXpCht5NuPjTo5p51oUE8t95Dht2qlEdXAkGO39k/h42p54vhqcfuF7u/eqVMdX6pEJyOokFmsdDmdVZziyhZghrTI/nDlctxCPcqFkeCHU4SIBZs85NS8uk=,iv:Q8k8OXSS3lFw33UO8JiZYNkrH3s+Cvh0xnAbMiBmnNA=,tag:DtNYKgDYB2nSHIjvMdvu/w==,type:str]",
+	"sops": {
+		"age": [
+			{
+				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBTSzk1RUhIekVJRStQd3Er\nbXlHUmtVb201dkRteVR1VFpoMTVFcTFPSG5NCmlPcVM5cWVJQ0g0VHNXaS9rTzh2\nWTIyQnRXakVCRWRQL0xuVUdDOEV0WEUKLS0tIE43RENWL1M2STF1VzdMcHJTNThh\ndHpqNE9MMnkrMlIxN2FEcjZ6anRIbDAK3rZ1lzO42bH37lb+zoeF6rKoVgI0TBST\n9EoVwom5xOKtmVAh5jobY/z4TGSD1BqQ6P2rQ/IM1Dtw3/18Yk7TXQ==\n-----END AGE ENCRYPTED FILE-----\n",
+				"recipient": "age18yf7r0dalnue5vwzanxl046fxsskhu9lzvd488ajhz7rp62mu94scmw3w4"
+			},
+			{
+				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBkdDFsSTZHUG54ZWNtQVdj\nZno4enBaRVlaQU1wNTBEVDVscS9Jc1JaTXhjClA3YUNQa3B2L0JXY25SSHRGbS94\nNVVNdHZ5VzdXcWpXZG1ZS1U4T0NPUkEKLS0tIFJLVmZyazU4dWUyVnpvRDRWbHNn\nZFQ3dlhxN0lwc0loWEZIOE0yMElRV0EKeUVy2QpLHbJ8JUCl07f74V+ZnRkGfDdP\n5W28yiLuq+LYfKUaFYeRDvSVFCQo6FiYJcBPGmnPF5gg1BIUtUUBYw==\n-----END AGE ENCRYPTED FILE-----\n",
+				"recipient": "age1qm0p4vf9jvcnn43s6l4prk8zn6cx0ep9gzvevxecv729xz540v8qa742eg"
+			}
+		],
+		"lastmodified": "2026-09-18T02:02:10Z",
+		"mac": "ENC[AES256_GCM,data:Oq1UCi+VYuuAkMmVBife740m6fiXC+PfkaQAii+FORyv8Zpj938cPrZzE9z/LO5Ixye5cbUHGRhZr0vM1egnv9nhIFyfGinKyE/BLEOXHxOtHnAXSQOJU2bWiR6w/QzVCTy6vTTVnqD2AtEfbKndIK1PJ0ASLvxMGaRqRsA/juE=,iv:xCEQg6DHV6hbyfBk62bUKA1lnC3HgQtkn2o8i2CFjhs=,tag:Zvt9tomYGoDFDQGjLZC59A==,type:str]",
+		"version": "3.13.3"
+	}
+}

modules/clan/phonebox-global/tests/vm/vars/per-machine/nodeA/yggdrasil/privateKey/users/admin

@@ -0,0 +1 @@
+../../../../../../sops/users/admin

modules/clan/phonebox-global/tests/vm/vars/per-machine/nodeA/yggdrasil/publicKey/value

@@ -0,0 +1 @@
+cf28bbcd822efec197dfaa99fbe9004f78b4efa9724b4f453d05f12a61a0bb44