0.2.42: external Administrator role with entity-scoped management

The external fund_administrator role (relabeled Administrator) now signs
into the full admin interface, fenced to the funds and SPVs granted to
it via EntityAccess:

- Partners, capital accounts, documents (upload and delete), entity
  edits, and eNAV imports for its own funds only; no fund creation,
  valuation sign-off, audit log, or investor view.
- Scoped user management: sees and manages only investors tied to its
  funds; creates investor accounts only; updates preserve grants on
  funds outside its scope.
- New DELETE /api/users/{id} (in-app Delete user button) with the
  cascade cleanup factored out of the CLI; Service Admin and self are
  protected, and an Administrator can only delete an investor who
  belongs solely to its funds.
- Internal fund_admin relabeled 'Staff (all funds)' and dropped from
  the create picker to end the two-similar-names confusion.
- Version badge removed from the UI (sidebar and portal header); the
  build version now logs to the browser console instead.
- deploy/.startos (signing key) added to .gitignore.

backend/ten31portal/routers/position_router.py

@@ -6,7 +6,9 @@ from fastapi import APIRouter, Depends, HTTPException
 from sqlmodel import Session, select
 
 from ten31portal.audit import record_audit
-from ten31portal.auth import require_internal, require_writer
+from ten31portal.auth import (
+    check_administrator_scope, require_internal_or_administrator, require_writer,
+)
 from ten31portal.database import get_session
 from ten31portal.models import Holding, Position, Valuation, ValuationRound, RoundStatus, User
 from ten31portal.schemas import PositionCreate, PositionResponse, PositionUpdate
@@ -22,12 +24,13 @@ def _dollars_to_cents(dollars: float) -> int:
 @router.get("/api/holdings/{holding_id}/positions")
 def list_positions(
     holding_id: int,
-    user: User = Depends(require_internal),
+    user: User = Depends(require_internal_or_administrator),
     session: Session = Depends(get_session),
 ) -> list[PositionResponse]:
     holding = session.get(Holding, holding_id)
     if holding is None:
         raise HTTPException(status_code=404, detail="Holding not found")
+    check_administrator_scope(user, holding.entity_id, session)
     rows = session.exec(select(Position).where(Position.holding_id == holding_id)).all()
     return [PositionResponse.model_validate(r, from_attributes=True) for r in rows]