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/apps/officer-web/Screens/Dashboard/CapabilityPage.tsx

@@ -135,7 +135,7 @@ inputs:                 # optional — parameters the user fills in before runni
 - No triggers → task is only runnable from the Automation page
 
 ## Notes
-- Tasks run inside the user's sandboxed container
+- Tasks run on the host as the server owner
 - The markdown body after the frontmatter should contain step-by-step instructions for the agent
 </task-creation-guide>`;
 
@@ -243,7 +243,7 @@ inputs:
 - \`object\` — JSON object
 
 ## Notes
-- Tools run inside the user's sandboxed container
+- Tools run on the host as the server owner
 - The \`name\` field uses snake_case (this is the function name the agent calls)
 - The \`label\` field is the human-readable display name
 - Mark parameters as \`optional: true\` when they have sensible defaults