Closes #1413.

Problem

The admin index "Recent actions" sidebar is scoped to the current user's own actions (Django's for_user filter), so a superuser can only see My actions — no easy way to see what other editors/contributors have done. Every admin add/change/delete is recorded in django.contrib.admin.models.LogEntry; it was just never surfaced.

What this does (Option A)

Registers LogEntry as a read-only, superuser-only admin so a superuser can browse everyone's admin activity:

• Filter by user, action type (add/change/delete), and content type
• Search by object name, change message, username/name
• Columns: time, user, colored action label, content type, link to the affected object (repr fallback for deletions), change summary
• Strictly read-only — it's an append-only audit trail
• Superuser-only visibility (matches the Grant/Award access model); editors/contributors can't see or reach it
• Appears under Administration as "Log entries"

Tests

New website/tests/test_logentry_admin.py (6 tests, all passing) pins:

• read-only + superuser-only permission enforcement
• end-to-end changelist (200 for superuser, non-200 for an editor)
• display columns don't raise on any action type (incl. the deletion fallback)

Screenshots

UI change — screenshot of the Log entries changelist to follow.

Notes

Considered Option B (widen the sidebar panel for superusers); not doing that here — the filterable changelist is the more useful tool.

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