Adds a very simple admin verb to view everything in the policy json (#89541)

## About The Pull Request

Adds `Policy Panel` admin verb. It opens up a very plain, very simple
tgui that shows you a dropdown of all `policy.json` entries, allowing
you to refer to them if necessary.

There's also a search bar.


![image](https://github.com/user-attachments/assets/11e5c4b1-815b-488d-8566-943145c2d64c)

## Why It's Good For The Game

Half request, half something I thought would be useful.

While admins could VV into config and find the `policy.json`, they
generally appreciate something more user-facing.

## Changelog

🆑 Melbert
admin: Adds the Policy Panel verb, which shows you all the policy the
server has set.
/🆑

code/modules/admin/verbs/policy_panel.dm

@@ -0,0 +1,28 @@
+ADMIN_VERB(policy_panel, R_ADMIN, "Policy Panel", "View all policy the server has set.", ADMIN_CATEGORY_MAIN)
+	if(!length(global.config?.policy))
+		tgui_alert(usr, "Policy hasn't loaded yet (or the server has none set).", "Policy Panel", list("OK"))
+		return
+
+	var/datum/policy_panel/tgui = new
+	tgui.ui_interact(user.mob)
+	BLACKBOX_LOG_ADMIN_VERB("Policy Panel")
+
+// Very simple panel that reports all the policy the server has set.
+/datum/policy_panel
+
+/datum/policy_panel/ui_interact(mob/user, datum/tgui/ui)
+	ui = SStgui.try_update_ui(user, src, ui)
+	if(!ui)
+		ui = new(user, src, "Policypanel")
+		ui.open()
+
+/datum/policy_panel/ui_state(mob/user)
+	return ADMIN_STATE(R_ADMIN)
+
+/datum/policy_panel/ui_close(mob/user)
+	qdel(src)
+
+/datum/policy_panel/ui_static_data(mob/user)
+	var/list/data = list()
+	data["policy"] = global.config.policy
+	return data