me: voicemail page, greetings, My Phone home

/api/me/voicemail lists, streams (Range, download) and marks read or
deletes through AMI VoicemailMove/VoicemailRemove, then rescans so MWI
and the list agree. /api/me/greetings takes the raw recording or file and
converts it with ffmpeg to 8 kHz PCM (media/audio.ts). My Phone gets a
layout with Home (new voicemails) and Voicemail (play marks read,
download, delete, record/upload greetings via MediaRecorder); the list
refetches on the live voicemail.new event. e2e m4-t3 checks MWI goes off
within 5 s after play and delete, and a browser-recorded greeting is what
callers hear.

Task: M4-T3

docs/spec/05-web-ui.md

@@ -94,7 +94,7 @@ Implementation notes (M3):
 
 | Page | Path | Contents |
 |---|---|---|
-| Home | `/me` | Status card (DND toggle, forwarding summary, queue login toggles), missed calls, new voicemails, colleagues presence list |
+| Home | `/me` | Status card (DND toggle, forwarding summary, queue login toggles), missed calls, new voicemails, colleagues presence list. M4 ships only new voicemails; the rest arrives with DND/forwarding (M6), call history (M7) and presence (M5-T3) |
 | Calls | `/me/calls` | Own call history, click a number to call back, add to contacts |
 | Voicemail | `/me/voicemail` | List (new bold), play (marks read), download, delete. Greetings section: record in the browser (MediaRecorder → upload), upload, or delete for unavail/busy/name |
 | Contacts | `/me/contacts` | Personal + company (read-only) with search, click to call |