Persistence Panel (#22979)

# Summary

This PR adds a new admin panel for persistence.

## Contents

- The panel features information about the current round and detailed
tracking of objects, records and generics.
- The previously introduced toggle-persistence verb has been removed and
integrated into the new panel.
- The panel can be seen by admins, mods and devs, but the
toggle-persistence is still locked to admin permissions only.

## Preview

The images are WIP and subject to change.

<img width="918" height="229" alt="image"
src="https://github.com/user-attachments/assets/16d3d73d-32e6-4907-bdff-d96699c27d49"
/>

<img width="919" height="253" alt="image"
src="https://github.com/user-attachments/assets/92e7f4d9-ccd4-4e79-949d-b8a35039da01"
/>

<img width="923" height="285" alt="image"
src="https://github.com/user-attachments/assets/e3796504-4cc6-4fce-b5f1-4df3486bfbee"
/>

<img width="923" height="270" alt="image"
src="https://github.com/user-attachments/assets/9fbb185d-181a-40ec-b89b-58eafcd47e4d"
/>

code/game/objects/objs.dm

@@ -106,6 +106,10 @@
 	var/persistent_objects_author_ckey = null
 	// Expiration time used when saving/updating a persistent type, this can be changed depending on the use case by assigning a new value
 	var/persistent_objects_expiration_time_days = PERSISTENT_DEFAULT_EXPIRATION_DAYS
+	// Database timestamp when the tracked object was created
+	var/persistent_objects_created_at = null
+	// Database timestamp when the tracked object will expire
+	var/persistent_objects_expires_at = null
 	/* END PERSISTENCE VARS */
 
 	/// for easy reference of talking atoms