fix: Update nginx config to use dynamic DNS resolution

- Replace upstream blocks with resolver directive
- Use variables for backend addresses to avoid startup errors
- Simplify configuration with single server block
- Add health check endpoint

server/nginx/nginx.conf

@@ -20,16 +20,10 @@ http {
     gzip_min_length 1024;
     gzip_types text/plain text/css application/json application/javascript text/xml application/xml;
 
-    # Upstream servers
-    upstream gitea {
-        server gitea:3000;
-    }
+    # Resolver for Docker DNS
+    resolver 127.0.0.11 valid=30s;
 
-    upstream nanaxe_api {
-        server nanaxe-api:8080;
-    }
-
-    # HTTP server - redirects to HTTPS
+    # Main server - serves static files and proxies to services
     server {
         listen 80;
         server_name _;
@@ -39,54 +33,42 @@ http {
             root /var/www/certbot;
         }
 
-        # Uncomment for HTTPS redirect
-        # return 301 https://$server_name$request_uri;
-
-        # Or proxy to services for local development
-        location / {
-            root /usr/share/nginx/html;
-            try_files $uri $uri/ /index.html;
+        # Health check endpoint
+        location /health {
+            access_log off;
+            return 200 "healthy\n";
+            add_header Content-Type text/plain;
         }
-    }
 
-    # API Server
-    server {
-        listen 80;
-        server_name api.*;
-
-        location / {
-            proxy_pass http://nanaxe_api;
+        # API proxy
+        location /api/ {
+            set $api_backend nanaxe-api:8080;
+            proxy_pass http://$api_backend;
             proxy_http_version 1.1;
-            proxy_set_header Upgrade $http_upgrade;
-            proxy_set_header 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_cache_bypass $http_upgrade;
-            
-            # Timeouts
             proxy_connect_timeout 60s;
             proxy_send_timeout 60s;
             proxy_read_timeout 60s;
         }
-    }
 
-    # Gitea Server
-    server {
-        listen 80;
-        server_name git.*;
-
-        location / {
-            proxy_pass http://gitea;
+        # Gitea proxy
+        location /git/ {
+            set $gitea_backend gitea:3000;
+            proxy_pass http://$gitea_backend;
             proxy_http_version 1.1;
-            proxy_set_header Upgrade $http_upgrade;
-            proxy_set_header 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_cache_bypass $http_upgrade;
+        }
+
+        # Default - static files
+        location / {
+            root /usr/share/nginx/html;
+            try_files $uri $uri/ /index.html;
         }
     }