fix: use Express 5 wildcard syntax for content negotiation route

Express 5 uses path-to-regexp v8 which requires named wildcards.
Bare "*" is no longer valid — use "{*path}" instead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

index.js

@@ -192,7 +192,7 @@ export default class ActivityPubEndpoint {
     const router = express.Router(); // eslint-disable-line new-cap
     const self = this;
 
-    router.get("*", async (request, response, next) => {
+    router.get("{*path}", async (request, response, next) => {
       const accept = request.headers.accept || "";
       const isActivityPub =
         accept.includes("application/activity+json") ||

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@rmdes/indiekit-endpoint-activitypub",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "description": "ActivityPub federation endpoint for Indiekit via Fedify. Adds full fediverse support: actor, inbox, outbox, followers, following, syndication, and Mastodon migration.",
   "keywords": [
     "indiekit",