Restore admin route DOC metadata for /api/v1/docs

[Copilot]

This addresses the linked PR review thread by restoring the missing documentation metadata for the admin email allowlist route. The docs collector already includes admin.py; this change makes that module discoverable again in /api/v1/docs.

• Problem

  • python/routes/admin.py was on the explicit collect_doc_meta() allowlist, but it no longer contained a # DOC block.
  • Result: the admin email allowlist endpoints were omitted from the generated docs output despite being registered for collection.

• Change

  • Re-added the route-level # DOC metadata in python/routes/admin.py:
    • module label and description
    • tier
    • endpoint entries for list/add/remove admin emails
  • Updated the file annotation stamp after the edit to keep repo-required metadata consistent.

• Effect

  • /api/v1/docs can surface the admin module again without changing any route behavior or collector logic.
  • Scope stays limited to the review-thread issue; no runtime path or API contract changed.

# DOC module: admin
# DOC label: Admin Email Allowlist
# DOC description: Admin-only endpoints for listing, adding, and removing admin email allowlist entries.
# DOC tier: admin
# DOC endpoint: GET /api/v1/admin/emails | List configured admin email entries.
# DOC endpoint: POST /api/v1/admin/emails | Add an admin email entry.
# DOC endpoint: DELETE /api/v1/admin/emails/{email} | Remove an admin email entry.