cdr: store Cdr events, aggregate calls, fixtures from real calls

services/cdr.ts stores every AMI Cdr event in cdr and, 5 s after a
call's last event, builds its calls row (direction, status, from, to,
DID, answered by, talk time) and call_extensions (caller, rang,
answered) per 04 §5.4; linkedids without a calls row are caught up on
AMI connect. Aggregation is idempotent.

test/asterisk/cdr-record.ts records 8 scenarios with our config, the
fake voip.ms (now shared in provider.ts) and baresip phones; each has a
fixture and a test with the expected calls row. Queue abandon and park
come with M8.

Found while recording: Asterisk 24's Cdr event has no LinkedID unless
cdr_manager maps it, its times carry no zone (now usegmtime), and the
mappings read CDR variables, so the dialplan sets CDR(SP_DID) and
CDR(SP_DIRECTION) next to the channel variables. The Asterisk image
needs a rebuild for the cdr_manager.conf change.

Task: M7-T1

apps/api/test/fixtures/cdr/internal-voicemail.json

@@ -0,0 +1,54 @@
+[
+  {
+    "Event": "Cdr",
+    "Privilege": "cdr,all",
+    "AccountCode": "",
+    "Source": "103",
+    "Destination": "102",
+    "DestinationContext": "sp-from-ext",
+    "CallerID": "\"Carol\" <103>",
+    "Channel": "PJSIP/103-00000002",
+    "DestinationChannel": "PJSIP/102-00000003",
+    "LastApplication": "Dial",
+    "LastData": "PJSIP/102/sip:102-0x59ff2dbd50b0@172.21.0.4:5072,5,tx",
+    "StartTime": "2026-10-18 19:33:04",
+    "AnswerTime": "2026-10-18 19:33:04",
+    "EndTime": "2026-10-18 19:33:09",
+    "Duration": "5",
+    "BillableSeconds": "5",
+    "Disposition": "NO ANSWER",
+    "AMAFlags": "DOCUMENTATION",
+    "UniqueID": "1792351984.3",
+    "UserField": "",
+    "LinkedID": "1792351984.3",
+    "sp_did": "",
+    "sp_direction": "",
+    "sp_recording": ""
+  },
+  {
+    "Event": "Cdr",
+    "Privilege": "cdr,all",
+    "AccountCode": "",
+    "Source": "103",
+    "Destination": "102",
+    "DestinationContext": "sp-from-ext",
+    "CallerID": "\"Carol\" <103>",
+    "Channel": "PJSIP/103-00000002",
+    "DestinationChannel": "",
+    "LastApplication": "VoiceMail",
+    "LastData": "102@default,u",
+    "StartTime": "2026-10-18 19:33:09",
+    "AnswerTime": "2026-10-18 19:33:09",
+    "EndTime": "2026-10-18 19:33:15",
+    "Duration": "6",
+    "BillableSeconds": "6",
+    "Disposition": "ANSWERED",
+    "AMAFlags": "DOCUMENTATION",
+    "UniqueID": "1792351984.3",
+    "UserField": "",
+    "LinkedID": "1792351984.3",
+    "sp_did": "",
+    "sp_direction": "",
+    "sp_recording": ""
+  }
+]