clanService/phonebox: global decentralized number directory over yggdrasil

Replace the static prefix+extension numbering with random 6 digit box
numbers (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.

Drop the server-prefix-number and ata-local-number vars, add a two-node
VM test that proves directory convergence and a call over yggdrasil.

modules/clan/phonebox/tests/vm/vars/per-machine/nodeA/phonebox/number/value

@@ -0,0 +1 @@
+651944

modules/clan/phonebox/tests/vm/vars/per-machine/nodeA/phonebox/owner-name/value

@@ -0,0 +1 @@
+fake_line_value

modules/clan/phonebox/tests/vm/vars/per-machine/nodeA/phonebox/public-key/value

@@ -0,0 +1 @@
+52460c3f17375aef0b8baa1e20be141901d9b99affb6a5b0dac90684d0047acc

modules/clan/phonebox/tests/vm/vars/per-machine/nodeA/phonebox/signature/value

@@ -0,0 +1 @@
+COjaD1KTdEbR3H/0z5VT3DCEBs7WFsejnMhT6OLYMzeWTvZlJ+0Da3a9NvrFfSaa3GiMYFIp7dDHV3Xqba78AA==

modules/clan/phonebox/tests/vm/vars/per-machine/nodeA/state-version/version/value

@@ -0,0 +1 @@
+26.11

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

@@ -0,0 +1 @@
+201:b6e7:cf03:a322:9443:d1d1:5787:7d07

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

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

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

@@ -0,0 +1,18 @@
+{
+	"data": "ENC[AES256_GCM,data:VeeLshHQC8jAWAo9u1TnVL7C6rWvh9hgRViLwhOk5uvOdQn9FvmydPKphlFD0/V65PBLN8fwt/pyhDfaItmNluW7bQBHmvoZE20voVM9srWAcwuyr4gUawJlI1QeCYL7wsGobZ/FH0ID7JglrX4fOaPkQUnhdHI=,iv:hEn5z2s7bDuZtQKaHhwmQXoRPop3S9jv/KSzPsYvHN0=,tag:hM/ElS6ZzaVyjjzqy4gm0g==,type:str]",
+	"sops": {
+		"age": [
+			{
+				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBrdkI1cFRXdXRQM3RtbmY1\nTTZGSFBwbkJETUw4ZUJHVEdPYnhyN2lVSDFJClkrSjJWbFJRYnd1Smt4dXVqd1hS\nSkI0UzhwQStkeXprWHZ3RnFQOUh0RDAKLS0tIENNTjdTNVdqbUh3TENFUnpFbWc5\nYisxZVptWXQ3b21ZLy8zbHBxaC82S1UKRDuRZ1IUHatj4IvMl8d7ixzwX1F17Nm3\nYS+cQ5W3gc/lCle5bguACeGYlGvqTUWMl2EDVX+TDp054pYsKtecJg==\n-----END AGE ENCRYPTED FILE-----\n",
+				"recipient": "age1qm0p4vf9jvcnn43s6l4prk8zn6cx0ep9gzvevxecv729xz540v8qa742eg"
+			},
+			{
+				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBKSGxvdllTWnpEU0FxYkx4\nSnNiR0VOMzhZR1FDclM5RkdpOHk3emxnTkdrCkt4KzBDczhtNDIyUElrQ1EyL3Q3\ndjhNSUxUaFVDd3Fqa1NJS1dwSHl5dVkKLS0tIDI4anhsSjB6bmlYUlVudktSMnI3\nMlRKMUNkaS95bjQ4cXdiQVIzSWlPY0UKcMwMWNX8t1KKOfjJl1i8GJvDbnDY68X6\nz4j4BFSDJiZ1wTaKO0tZMb3NaDDVr4TZUPJwaKwepSqjVY0BizTuNw==\n-----END AGE ENCRYPTED FILE-----\n",
+				"recipient": "age1r2lq949hmh0xr74p7r53ksxvgdvljpxcdqnx2xr0gk2dgsvcg56qapalmt"
+			}
+		],
+		"lastmodified": "2026-09-17T04:58:58Z",
+		"mac": "ENC[AES256_GCM,data:HOLDDIfvnmzYCuqPYGgcMeD0AZHl8BFcY6gbu/2WZiO9roce1EcTtiGAzZyBYK0eqvNbxOxCOx7qhvM+8KKHwqPctMmpyWuPu/hpEPPHQ6ufF14jsIEyJJeOJAJfmx7t1tfen1lsyM1EoGNszp7h8ANjzfitN7VWUw+yTrlDsgY=,iv:KhwlvAzinbT2YBqRHdLDzr4lnlqhNQoJQ/gqDDQ7TMk=,tag:/Bu6SEVMG9Sn2pxIOR7NxQ==,type:str]",
+		"version": "3.13.3"
+	}
+}

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

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

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

@@ -0,0 +1 @@
+52460c3f17375aef0b8baa1e20be141901d9b99affb6a5b0dac90684d0047acc