Group the module crates under modules/

The service pseudo-clients and the ircd protocol link sat flat at the
repo root, mixed in with the daemon core and the SDK. Move them all
under modules/ so the tree separates concerns cleanly: the daemon in
src/, the SDK every module links against in api/, and the loadable
modules — the pseudo-clients plus the protocol link — in modules/.

Workspace members, the daemon's per-crate dependency paths, and each
module's api path are updated to match; the docs follow. No code change.

modules/hostserv/src/list.rs

@@ -0,0 +1,18 @@
+use fedserv_api::{Sender, ServiceCtx, Store};
+
+// LIST: every account with an assigned vhost. Operators only.
+pub fn handle(me: &str, from: &Sender, ctx: &mut ServiceCtx, db: &dyn Store) {
+    if !super::require_oper(me, from, ctx) {
+        return;
+    }
+    let vhosts = db.vhosts();
+    if vhosts.is_empty() {
+        ctx.notice(me, from.uid, "No vhosts have been assigned.");
+        return;
+    }
+    ctx.notice(me, from.uid, format!("Assigned vhosts ({}):", vhosts.len()));
+    for v in &vhosts {
+        let temp = if v.expires.is_some() { ", temporary" } else { "" };
+        ctx.notice(me, from.uid, format!("  \x02{}\x02 — {} (by {}{temp})", v.account, v.host, v.setter));
+    }
+}