🎓 Initial commit: Math2 Platform - Plataforma de Álgebra Lineal PRO

✨ Características:
- 45 ejercicios universitarios (Basic → Advanced)
- Renderizado LaTeX profesional
- IA generativa (Z.ai/DashScope)
- Docker 9 servicios
- Tests 123/123 pasando
- Seguridad enterprise (JWT, XSS, Rate limiting)

🐳 Infraestructura:
- Next.js 14 + Node.js 20
- PostgreSQL 15 + Redis 7
- Docker Compose completo
- Nginx + SSL ready

📚 Documentación:
- 5 informes técnicos completos
- README profesional
- Scripts de deployment automatizados

Estado: Producción lista ✅

docker/nginx/nginx.prod.conf

@@ -0,0 +1,149 @@
+# ========================================
+# NGINX PRODUCTION CONFIGURATION
+# With SSL/TLS and Reverse Proxy
+# ========================================
+
+user nginx;
+worker_processes auto;
+error_log /var/log/nginx/error.log warn;
+pid /var/run/nginx.pid;
+
+events {
+    worker_connections 4096;
+    use epoll;
+    multi_accept on;
+}
+
+http {
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+
+    # Logging format
+    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
+                    '$status $body_bytes_sent "$http_referer" '
+                    '"$http_user_agent" "$http_x_forwarded_for" '
+                    'rt=$request_time uct="$upstream_connect_time" '
+                    'uht="$upstream_header_time" urt="$upstream_response_time"';
+
+    access_log /var/log/nginx/access.log main;
+
+    # Basic settings
+    sendfile on;
+    tcp_nopush on;
+    tcp_nodelay on;
+    keepalive_timeout 65;
+    types_hash_max_size 2048;
+    client_max_body_size 50M;
+
+    # Gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_proxied any;
+    gzip_comp_level 6;
+    gzip_types text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;
+
+    # Rate limiting
+    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
+    limit_req_zone $binary_remote_addr zone=auth:10m rate=5r/m;
+
+    # Security headers
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header X-XSS-Protection "1; mode=block" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+
+    # Upstream backends
+    upstream backend_servers {
+        least_conn;
+        server backend:3001 max_fails=3 fail_timeout=30s;
+        keepalive 32;
+    }
+
+    upstream frontend_servers {
+        least_conn;
+        server frontend:3000 max_fails=3 fail_timeout=30s;
+        keepalive 32;
+    }
+
+    # HTTP to HTTPS redirect
+    server {
+        listen 80;
+        server_name _;
+        
+        location /.well-known/acme-challenge/ {
+            root /var/www/certbot;
+        }
+        
+        location / {
+            return 301 https://$host$request_uri;
+        }
+    }
+
+    # HTTPS Server
+    server {
+        listen 443 ssl http2;
+        server_name _;
+
+        # SSL Configuration
+        ssl_certificate /etc/letsencrypt/live/mathplatform.com/fullchain.pem;
+        ssl_certificate_key /etc/letsencrypt/live/mathplatform.com/privkey.pem;
+        ssl_trusted_certificate /etc/letsencrypt/live/mathplatform.com/chain.pem;
+
+        # SSL Security
+        ssl_protocols TLSv1.2 TLSv1.3;
+        ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
+        ssl_prefer_server_ciphers off;
+        ssl_session_cache shared:SSL:50m;
+        ssl_session_timeout 1d;
+        ssl_session_tickets off;
+        ssl_stapling on;
+        ssl_stapling_verify on;
+
+        # Security headers
+        add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
+
+        # Health check endpoint
+        location /health {
+            access_log off;
+            return 200 "healthy\n";
+            add_header Content-Type text/plain;
+        }
+
+        # Backend API
+        location /api/ {
+            limit_req zone=api burst=20 nodelay;
+            
+            proxy_pass http://backend_servers/;
+            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;
+            proxy_read_timeout 300s;
+            proxy_connect_timeout 75s;
+        }
+
+        # Frontend
+        location / {
+            proxy_pass http://frontend_servers;
+            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 $http_upgrade;
+        }
+
+        # Static files caching
+        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+            proxy_pass http://frontend_servers;
+            expires 1y;
+            add_header Cache-Control "public, immutable";
+        }
+    }
+}