provisioning: phones, /prov with Basic auth, rate limit and IP block

/api/devices CRUD (MAC in any format → 12 lowercase hex; a 20-char
provisioning password, stored encrypted and shown to admins, who type
it into the phone) and GET /:id/config-preview with passwords masked.

GET /prov/... per 07 §2: <mac>.cfg (Yealink), cfg<mac>.xml
(Grandstream), the empty Yealink common file. Basic auth with the MAC
and the device's password (timing-safe), 404 for unknown MACs or the
other vendor's file, 403 outside the local nets when LAN-only, 404 when
provisioning is off, Cache-Control no-store, last provisioned time and
IP recorded. Limits: 20 requests / 10 min per IP outside the local nets
(an office's phones rebooting together would pass it), and 10 failures
block the IP for an hour. A first request without credentials isn't a
failure: phones ask that way and retry after the 401.

Templates (pure functions of a ProvisionContext) hold the account,
voicemail, pickup codes and the provisioning settings; BLF, time zone
and phonebook come with M10-T2.

Web: Phones page (table, drawer with what to type into the phone,
config preview; manual settings for generic phones). e2e m10-t1: phone
added in the UI, 401 then the file, and a baresip phone registers with
only the account from it.

Also: the loadSnapshot test made its database inside the test (20 s);
under a full parallel run that timed out now and then. It now does it
in a hook like the others.

Task: M10-T1

docs/spec/01-infrastructure.md

@@ -648,7 +648,6 @@ COPY --from=build /out/node_modules ./node_modules
 COPY --from=build /src/apps/api/dist ./dist
 COPY --from=build /src/apps/web/dist ./public
 COPY --from=build /src/apps/api/src/db/migrations ./dist/db/migrations
-# ponytail: provisioning templates (M10) get their COPY line when they exist.
 ENV NODE_ENV=production
 ENTRYPOINT ["/usr/bin/tini","--"]
 CMD ["node","dist/index.js"]