memos sidecar

wraps the self-hosted memos instance, same shape as transmission and slskd. no
schema change was needed: service_connections already says `service` is text
because "adding a service should not be a schema change", and memos is the
one-instance-per-owner case that table was built for.

the sidecar holds the url and the personal access token; the platform side is
16 lines of createSidecarProxy and holds neither.

/_api/* is a pass-through onto the instance's own /api/v1 rather than a
hand-written wrapper per endpoint — memos generates its rest api from protobufs
and it moves between minor versions, so re-describing it here would be a second
thing to keep in sync. the allow-list is the one piece of policy, and it keeps
this from being a general ssrf hop. auth routes are excluded: signin/signout
would mint sessions on the instance, and this authenticates with a stored token.

probing is two calls on purpose. /healthz answers unauthenticated, so a bad url
is distinguishable from a bad token — memos returns 200 and an empty list for
unauthenticated reads rather than 401, so "the list came back" proves nothing.

verified against the live container: unconfigured reports not-connected, a bad
token is rejected WITH the reason and nothing is stored, and the platform mount
401s without a session.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/servers/sidecar/protocol.ts

@@ -73,6 +73,8 @@ export type SidecarEvent =
   | { type: 'invoiceshelf:server'; port: number }
   // Photos (Immich) — the sidecar reports where its HTTP server is listening (random port) on connect
   | { type: 'photos:server'; port: number }
+  // Memos — the sidecar reports where its HTTP server is listening (random port) on connect
+  | { type: 'memos:server'; port: number }
   // CalDAV/CardDAV — the sidecar reports where its HTTP server is listening (random port) on connect.
   // One port serves both doors: /dav (forwarded to Radicale) and /_officer (JSON for Officer's UI).
   | { type: 'caldav:server'; port: number }