Add Users and Organizations management to API Server panel

The superadmin panel had backend CRUD for users/orgs (internal/api/users.go,
orgs.go) but no UI. Add two tabs to panel/src/App.vue:

- Users: create form (email/password/role/org), list with role + org badges,
  inline editor (email/role/org/verified/password reset), and delete. Self-role
  change and self-delete are suppressed to mirror the server-side guards.
- Organizations: create, inline rename, and delete, with client-derived member
  counts; delete is disabled while an org still has members.

PocketBase validation errors are unwrapped into a readable line via a shared
apiError() helper. Rebuilds the embedded panel bundle (dist).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

API Server/internal/api/dist/assets/index-CVh8EDzq.css

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