R9 Web Push in decePub: one subscription per persona, each with its own token and registration

Settings gets "Notifications on this device" (PushEditor): personas, alerts in four groups, policy, a test
notification, after a one-time notice of what the push service learns. Each persona ticked gets its own service
worker registration (push-worker.js at push/{slot}/), so its own endpoint and keys, subscribed with its own token
(IHttpService's *As); nothing PrivaPub stores ties two personas together and the worker never reads the payload's
token. PushService follows the tokens (re-subscribing after a renewal), reconciles at every session start, turns
off before sign-out and drops deleted or suspended personas. A click opens that persona's notifications; the app
badge counts the unread ones. Exchanges now ask for the push scope.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WpVCoDeM1qUTRp4fXQdfof

Models/Types/PushPolicy.cs

@@ -0,0 +1,48 @@
+namespace decePubClient.Models.Types
+{
+	/// <summary>Whose notifications a Web Push subscription is pushed (Mastodon's data[policy]): anyone's, those of the
+	/// accounts the persona follows, of its followers, or nobody's. What the persona tells itself (its poll ended, a warning
+	/// from the staff) passes every policy but None.</summary>
+	public enum PushPolicy
+	{
+		All = 0,
+		Followed = 1,
+		Follower = 2,
+		None = 3
+	}
+
+	public static class PushPolicies
+	{
+		/// <summary>The policy as Mastodon's API names it.</summary>
+		public static string Name(PushPolicy policy) => policy switch
+		{
+			PushPolicy.Followed => "followed",
+			PushPolicy.Follower => "follower",
+			PushPolicy.None => "none",
+			_ => "all"
+		};
+
+		/// <summary>A policy Mastodon's API named; all for anything else, as PrivaPub reads a policy left out.</summary>
+		public static PushPolicy Of(string name) => name switch
+		{
+			"followed" => PushPolicy.Followed,
+			"follower" => PushPolicy.Follower,
+			"none" => PushPolicy.None,
+			_ => PushPolicy.All
+		};
+	}
+
+	/// <summary>
+	/// The alerts a decePub subscription offers: Mastodon 4.5's names (data[alerts]) that PrivaPub notifies, then Pleroma's
+	/// emoji reactions. PrivaPub keeps admin.sign_up, admin.report, quoted_update, severed_relationships and annual_report
+	/// too, but never fires them, so they are never offered and always sent off.
+	/// </summary>
+	public static class PushAlerts
+	{
+		public static readonly string[] Offered =
+		[
+			"mention", "status", "quote", "update", "poll", "favourite", "reblog", "pleroma:emoji_reaction", "follow", "follow_request",
+			"moderation_warning"
+		];
+	}
+}