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/servers/sidecar/vnc/vnc-manager.ts

@@ -1,7 +1,7 @@
 import { existsSync, mkdirSync } from 'node:fs';
 import { join } from 'node:path';
 import type { VncStartParams, VncSessionInfo } from '../protocol';
-import { getHomeDirForRole } from '@@/data-path';
+import { getOwnerHomeDir } from '@@/data-path';
 
 // Mirrors the physical display instead of spawning a virtual desktop per user, so the
 // browser shows the same session as the screen. There is exactly one :0, hence one
@@ -106,7 +106,7 @@ export async function startSession(params: VncStartParams): Promise<{ port: numb
   }
   mirror = null;
 
-  const homeDir = getHomeDirForRole(params.email, params.role);
+  const homeDir = getOwnerHomeDir(params.email);
   const passwdFile = await ensureVncPassword(homeDir);
 
   const xauthority = resolveXauthority();