Accounts the content mandates, a seed for the first person, and edits suggested by who is responsible

Every person a page names as responsible gets a Kanidm account at start
if they have none, and a mail saying they are listed as responsible for
asking that question, with the link to sign in; RESPONSIBLE_GROUP puts
them in one group. SEED_ADMIN_EMAIL invites the first person into the
most privileged group - the one whose desk may invite into the most -
once. Signed in, a responsible person may suggest a change to their
own pages; checked on the server, kept, published, and mailed to the
site's inbox.

Fixes an invite of someone new on a Kanidm with only the onboarding
account: the person is created with their address in one call, since
idm_people_on_boarding may create but not modify (it answered 403).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

src/main.rs

@@ -108,6 +108,8 @@ async fn main() -> anyhow::Result<()> {
     // windows (see announce.rs).
     tokio::spawn(portal::announce::run(state.clone()));
     tokio::spawn(portal::deadlines::run(state.clone()));
+    // The first person in, when SEED_ADMIN_EMAIL names one (seed.rs).
+    tokio::spawn(portal::seed::run(state.clone()));
 
     // Replies to case mail, matched to their record by whatever reads
     // the mailbox (uhhm/gdo over JMAP) and turned into notes here. A