mailu: the manifest matches the machine, provides smtp, and carries automx

Five gaps between the draft and what actually runs, each verified live
before being written down:

- front published bare 80 — the machine port Traefik holds; now the
  predecessor's own mappings (7080:80, 7443:443) plus the 110/143/995
  parity ports the draft dropped. Pruning legacy protocols is its own
  deliberate change, not a cutover side effect.
- TLS_FLAVOR said cert, which nothing supplies; live is letsencrypt —
  mailu runs its own certbot, state already on disk, HTTP-01 answered
  through a path-scoped route contribution (priority above the web one).
- the web route said http:7080, the redirect-loop shape; it now says
  what the hand-authored file always knew: https 7443, insecure.
- automx was absent entirely: the autoconfig responder is now a second
  artifact (its Containerfile moved in from the predecessor's images
  dir, base declared per ADR 0097), a container on a real data dir —
  the anonymous-volume loss of 2026-08-10 stays fixed — and the three
  public names are route contributions.
- and the reason this moved ahead of de-spiegel: mailu now provides
  smtp. A consumer contributes the account it sends as; the provisioner
  creates <account>@<domain> via the admin API and applies the minted
  password every reconcile (ADR 0048). The domain is served on the
  binding so a consumer composes its own login from mesh facts.

route-adapter learns to say no: a contribution over https, scoped to a
path, or carrying a policy is skipped aloud rather than written into a
file shape that cannot say it — plain http into a TLS listener was the
concrete wrong file this prevents. The hand-authored files keep covering
those routes until the mesh's own proxy takes over, exactly as today.

modules/mailu/automx/files/automx2.conf

@@ -0,0 +1,21 @@
+[automx2]
+# A typical production setup would use loglevel = WARNING
+loglevel = WARNING
+# Echo SQL commands into log? Used for debugging.
+db_echo = false
+
+
+# In-memory SQLite database
+# db_uri = sqlite:///:memory:
+
+# SQLite database in a UNIX-like file system
+db_uri = sqlite:////data/db.sqlite
+
+# MySQL database on a remote server. This example does not use an encrypted
+# connection and is therefore *not* recommended for production use.
+#db_uri = mysql://username:password@server.example.com/db
+
+# Number of proxy servers between automx2 and the client (default: 0).
+# If your logs only show 127.0.0.1 or ::1 as the source IP for incoming
+# connections, proxy_count probably needs to be changed.
+proxy_count = 1