[backend/akko-client] Expose VAPID public key

Iceshrimp.Backend/Controllers/Mastodon/InstanceController.cs

@@ -33,10 +33,14 @@ public class InstanceController(DatabaseContext db, MetaService meta) : Controll
 
 		var (instanceName, instanceDescription, adminContact) =
 			await meta.GetMany(MetaEntity.InstanceName, MetaEntity.InstanceDescription, MetaEntity.AdminContactEmail);
+		var vapidKey = await meta.Get(MetaEntity.VapidPublicKey); // can't merge with above call since they're all nullable and this is not.
 
 		return new InstanceInfoV1Response(config.Value, instanceName, instanceDescription, adminContact)
 		{
-			Stats = new InstanceStats(userCount, noteCount, instanceCount)
+			Stats = new InstanceStats(userCount, noteCount, instanceCount),
+			Pleroma = new() {
+				VapidPublicKey = vapidKey
+			}
 		};
 	}
 

Iceshrimp.Backend/Controllers/Mastodon/Schemas/InstanceInfoV1Response.cs

@@ -1,3 +1,4 @@
+using Iceshrimp.Backend.Controllers.Pleroma.Schemas.Entities;
 using Iceshrimp.Backend.Core.Configuration;
 using Iceshrimp.Backend.Core.Extensions;
 using J = System.Text.Json.Serialization.JsonPropertyNameAttribute;
@@ -33,6 +34,7 @@ public class InstanceInfoV1Response(
 
 	[J("urls")]          public InstanceUrls            Urls          => new(config.Instance);
 	[J("configuration")] public InstanceConfigurationV1 Configuration => new(config.Instance);
+	[J("pleroma")] public required PleromaInstanceExtensions Pleroma { get; set; }
 
 	//TODO: add the rest
 }

Iceshrimp.Backend/Controllers/Pleroma/Schemas/Entities/PleromaInstanceExtensions.cs

@@ -0,0 +1,8 @@
+using J = System.Text.Json.Serialization.JsonPropertyNameAttribute;
+
+namespace Iceshrimp.Backend.Controllers.Pleroma.Schemas.Entities;
+
+public class PleromaInstanceExtensions 
+{
+	[J("vapid_public_key")] public required string VapidPublicKey { get; set; }
+}