Add nginx and spectator services to docker-compose

Introduced nginx and spectator services to docker-compose-osurx.yml for improved routing and replay handling. Added nginx configuration file to restrict access to /_lio/ paths and proxy requests to spectator and app services. Also refactored environment variable management and removed direct port mapping from the app service.

nginx/default.conf

@@ -0,0 +1,56 @@
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    ''      close;
+}
+
+server {
+    listen 80;
+    server_name _;
+
+    client_max_body_size 50m;
+
+    # 屏蔽 /_lio/ 及其所有子路径的外部访问
+    location ~ ^/_lio/ {
+        return 403;
+    }
+
+    location /signalr/ {
+        proxy_pass http://spectator/;
+
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection $connection_upgrade;
+
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+
+        proxy_read_timeout 86400s;
+        proxy_send_timeout 86400s;
+        proxy_connect_timeout 60s;
+        proxy_cache_bypass $http_upgrade;
+
+        proxy_buffering off;
+    }
+
+    location / {
+        proxy_pass http://app:8000;
+
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection $connection_upgrade;
+
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+
+        proxy_read_timeout 86400s;
+        proxy_send_timeout 86400s;
+        proxy_connect_timeout 60s;
+        proxy_cache_bypass $http_upgrade;
+
+        proxy_buffering off;
+    }
+}