fix: server settings groups tab visible to owner

Server interface had 'ownerId' (camelCase) but API returns
'owner_id' (snake_case). isOwner was always false, hiding
groups/roles/audit tabs for the server owner.

web/src/components/CreateServerModal.tsx

@@ -45,7 +45,7 @@ export function CreateServerModal({ onClose }: CreateServerModalProps) {
         id: result.id,
         name: result.name,
         icon: result.icon,
-        ownerId: result.owner_id,
+        owner_id: result.owner_id,
       };
       useServerStore.getState().addServer(newServer);
       useServerStore.getState().setActiveServer(newServer.id);

web/src/lib/usePermissions.ts

@@ -28,7 +28,7 @@ export function usePermissions(serverId: string | null) {
   const roles = useRoleStore((s) => s.roles);
 
   const server = serverId ? servers.find((s) => s.id === serverId) : null;
-  const isOwner = Boolean(server && user && server.ownerId === user.id);
+  const isOwner = Boolean(server && user && server.owner_id === user.id);
 
   const memberRoles = roles.filter((r) => r.server_id === serverId);
 

web/src/stores/server.ts

@@ -5,7 +5,7 @@ export interface Server {
   id: string;
   name: string;
   icon: string | null;
-  ownerId: string;
+  owner_id: string;
   unread?: boolean;
 }