Fix endpoint names in url_for() calls; remove fallback URLs from api.js

templates/vue3_neusik/index.html

@@ -11,8 +11,8 @@
 </div>
 <script>
 window.NEUSICIAN_URLS = {
-    astlog:  "{{ url_for('get_static_astlog') }}",
-    score:   "{{ url_for('plain_text_score') }}",
+    astlog:  "{{ url_for('astlog') }}",
+    score:   "{{ url_for('score') }}",
     status:  "{{ url_for('statusjson') }}",
     result:  "{{ url_for('send_audio_generated') }}",
     submit:  "{{ url_for('public-yaml-acceptor') }}"