R9 Web Push, then the honest version: VAPID key, push subscriptions, encrypted pushes, 4.5.0 advertised

The server's VAPID key (PushKeys, made on first need, in Mongo) is the instance API's vapid.public_key and every app's
vapid_key. /api/v1/push/subscription (POST, GET, PUT, DELETE) keeps one subscription per access token, so per persona;
every notification kept (never a filtered one) is queued as a SendPush job for the subscriptions whose alert and policy
admit it, and sent through the `push` client (the safe handler, https only) encrypted as RFC 8291 aes128gcm or the
aesgcm draft with an ES256 VAPID JWT. 404/410 delete the subscription, 429/5xx/timeouts retry, other answers drop the
push. Subscriptions end with their tokens (revocation, sessions ended, suspension, deletion, a restore); backups hold
neither keys nor subscriptions. The walk of every Mastodon 4.3-4.5 client route (docs/MASTODON-API.md) added
conversations/:id/unread, domain_blocks/preview, v2 notifications clear and PUT policy, /oauth/userinfo and stubs, so both
instance APIs now say 4.5.0 (compatible; PrivaPub <release>). The pasture gets a push sink (pushsink.test) and
scenarios/push.sh in batch A.

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

PrivaPub/Api/Mastodon/Infrastructure/MastodonController.cs

@@ -48,7 +48,8 @@ namespace PrivaPub.Api.Mastodon.Infrastructure
 			var scope = context.ActionDescriptor.EndpointMetadata.OfType<ScopeAttribute>().LastOrDefault();
 			if (User.Identity?.IsAuthenticated == true)
 			{
-				if (scope != default && !MastodonScopes.Grants(User.GetScopes(), scope.Scope))
+				// (a scope written a|b is either)
+				if (scope != default && !scope.Scope.Split('|').Any(one => MastodonScopes.Grants(User.GetScopes(), one)))
 				{
 					context.Result = Error(StatusCodes.Status403Forbidden, "This action is outside the authorized scopes");
 					return;