feat: real-time Federation panel updates via WS events

Added federation_peers_changed (no-payload signal) broadcast from every
peer state mutation, and federation_approval_request_received when a new
approval request is queued. Client subscribes via onFederationPeersChanged
callback registry. FederationPanel and PendingApprovals debounce-refetch
on any event. sendToAdmins helper broadcasts only to admin users.

packages/server/src/routes/federation.ts

@@ -469,6 +469,13 @@ export async function federationRoutes(app: FastifyInstance): Promise<void> {
               .run();
           }
 
+          // Notify admin users that a new approval request arrived
+          connectionManager.sendToAdmins({
+            type: 'federation_approval_request_received' as const,
+            origin: sourceOrigin,
+            instanceName: reqInstanceName ?? undefined,
+          });
+
           return reply.code(202).send({
             queued: true,
             message: 'Request queued for admin approval',
@@ -514,6 +521,8 @@ export async function federationRoutes(app: FastifyInstance): Promise<void> {
             });
           }
 
+          connectionManager.sendToAdmins({ type: 'federation_peers_changed' as const });
+
           return reply.code(200).send({ accepted: true });
         }
         if (existing.status === 'awaiting_approval') {
@@ -535,6 +544,8 @@ export async function federationRoutes(app: FastifyInstance): Promise<void> {
             });
           }
 
+          connectionManager.sendToAdmins({ type: 'federation_peers_changed' as const });
+
           return reply.code(200).send({ accepted: true });
         }
         // Pending — update with new secret and activate
@@ -547,6 +558,8 @@ export async function federationRoutes(app: FastifyInstance): Promise<void> {
           .where(eq(schema.federationPeers.id, existing.id))
           .run();
 
+        connectionManager.sendToAdmins({ type: 'federation_peers_changed' as const });
+
         return reply.code(200).send({ accepted: true });
       }
 
@@ -561,6 +574,8 @@ export async function federationRoutes(app: FastifyInstance): Promise<void> {
         createdAt: Date.now(),
       }).run();
 
+      connectionManager.sendToAdmins({ type: 'federation_peers_changed' as const });
+
       return reply.code(200).send({ accepted: true });
     },
   );
@@ -733,6 +748,8 @@ export async function federationRoutes(app: FastifyInstance): Promise<void> {
         .where(eq(schema.federationPeers.id, peer.id))
         .run();
 
+      connectionManager.sendToAdmins({ type: 'federation_peers_changed' as const });
+
       // Push federation_peer_rejected WS event to affected users
       const entries = db
         .select({
@@ -1041,6 +1058,8 @@ export async function federationRoutes(app: FastifyInstance): Promise<void> {
           .where(eq(schema.peerApprovalRequests.id, id))
           .run();
 
+        connectionManager.sendToAdmins({ type: 'federation_peers_changed' as const });
+
         const peer = db
           .select()
           .from(schema.federationPeers)
@@ -1137,6 +1156,8 @@ export async function federationRoutes(app: FastifyInstance): Promise<void> {
           .run();
       }
 
+      connectionManager.sendToAdmins({ type: 'federation_peers_changed' as const });
+
       db.delete(schema.peerApprovalRequests)
         .where(eq(schema.peerApprovalRequests.id, id))
         .run();