remove the dead multi-user surface

Officer is single-user: the server owner is the only account, created once by
/auth/bootstrap. Everything that existed to serve additional users was
unreachable, so it is gone rather than left looking like it does something.

Accounts: drop the invite / resend-invite / delete / list-users routes and the
Users settings screen, the inert /auth/signup handler, and the account
verification chain it fed (verify, resend-verification, VerifyScreen, the
UserInvite + VerifyAdmin + VerifyRegistration templates). /auth/verify-token
survives for password resets only, and now requires a reset-password token
rather than accepting any signed JWT.

Roles: drop the users.role column and the four-value USER_ROLES enum. The
permissions table granted every role identical methods, and every
role === 'Super Admin' check was permanently true. The JWT no longer carries a
role claim.

Sandbox: remove sidecar/sandbox.ts and its five call sites. bwrap was selected
only for non-Super-Admin users, so it never ran. It was also not a usable agent
jail as written — --share-net, the project root (with .env) bound read-only,
and runuser dropping to the server's own uid. Rebuilding it for agent
containment would be a different construction, and git history keeps this one.

getHomeDir keeps its DATA_PATH meaning; the new getOwnerHomeDir resolves the
owner's real login home, which is what terminals, chats and task runs use.

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

src/workspaces/state/src/useModels.ts

@@ -72,17 +72,12 @@ export function useVisibleModels() {
   });
 }
 
-/** Models visible to the current user: system policy (members) or all (admins), minus per-user hidden. */
+/** Models visible to the owner: every model the server knows about, minus the ones they hid. */
 export function useUserVisibleModels() {
-  const allModels = useModels();
-  const policyModels = useVisibleModels();
-  const { user } = useAuth();
+  const base = useModels();
   const { settings } = useSettings();
 
-  const isAdmin = user?.role !== 'Member';
-  const base = isAdmin ? allModels : policyModels;
   const hidden = settings.chat.hiddenModels;
-
   if (!hidden || hidden.length === 0) return base;
 
   const hiddenSet = new Set(hidden);