scaffold sMusic: Tauri v2 player core (audio/library/tags/discord/tray) + cover relay + CI

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

cover-relay/nginx-smusic-cover.conf

@@ -0,0 +1,19 @@
+server {
+    listen 443 ssl;
+    server_name rpc.savsis.xyz;
+
+    ssl_certificate /etc/letsencrypt/live/rpc.savsis.xyz/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/rpc.savsis.xyz/privkey.pem;
+
+    location / {
+        proxy_pass http://127.0.0.1:8090;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+    }
+}
+
+server {
+    listen 80;
+    server_name rpc.savsis.xyz;
+    return 301 https://$host$request_uri;
+}