update environment configuration, enhance setup guide, and align documentation with new domain structure

infrastructure/nginx/nginx.conf

@@ -3,11 +3,25 @@ events {
 }
 
 http {
+    resolver 127.0.0.11 ipv6=off valid=30s;
+
+    map $http_upgrade $connection_upgrade {
+        default upgrade;
+        '' close;
+    }
+
     server {
         listen 80;
-        server_name localhost;
+        server_name www.linearvoid.tv;
 
-        root /usr/share/nginx/html;
+        return 301 https://linearvoid.tv$request_uri;
+    }
+
+    server {
+        listen 80 default_server;
+        server_name linearvoid.tv localhost 127.0.0.1;
+
+        root /srv/frontend;
         index index.html;
 
         # Serve static frontend
@@ -17,16 +31,20 @@ http {
 
         # Proxy chat WebSocket
         location /ws {
-            proxy_pass http://chat:3000;
+            set $chat_upstream http://chat:3000;
+            proxy_pass $chat_upstream;
             proxy_http_version 1.1;
             proxy_set_header Upgrade $http_upgrade;
-            proxy_set_header Connection "upgrade";
+            proxy_set_header Connection $connection_upgrade;
             proxy_set_header Host $host;
+            proxy_set_header X-Forwarded-Host $host;
+            proxy_set_header X-Forwarded-Proto $scheme;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         }
 
-        # Serve HLS from playout (with cache headers for Cloudflare)
+        # Local/dev fallback HLS origin. Production media should use MEDIA_DOMAIN.
         location /hls/ {
-            alias /usr/share/nginx/html/hls/;
+            alias /srv/hls/;
             add_header Cache-Control "public, max-age=3600";
             add_header Access-Control-Allow-Origin "*";
         }