Add admin doors management interface

[danieladugyan]

Introduce a new layout for managing doors in the admin section, including a form for door access rules, an empty state page, and a dialog for deleting access rules.

To-do

• Show whether rule is allow or ban
• Translations
• Drop commits included in other PRs (New design select component #1001 Add alert dialog component #1006)

Future work

• Require reason and end date for member rules
• Require reason for ban rules
• Don't allow banning groups since this currently has no effect (or implement group banning)
• Give user feedback when submitting form (success or errors)

[Isak-Kallini]

• Loop for doors in layout.svelte should use door.name not door.id
• Should not default end date
• When giving access to member it should not say valfritt for required fields
• Should we only allow stilid in db? People without accounts?

[github-actions]

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