Feat: Upgrade Docker deployment with multi-stage build and Nginx integration

- Upgrade Dockerfile to Go 1.24 with multi-stage build (backend + frontend)
- Add TA-Lib installation for technical analysis support
- Integrate frontend build into main container image
- Add Nginx reverse proxy configuration for API routing
- Update docker-compose.yml to simplified single-container architecture
- Update .dockerignore to include web source for build
- Improve health checks and startup time handling

Benefits:
- One-click deployment with single Docker image
- Better resource utilization with multi-stage build
- Production-ready Nginx frontend serving
- Easier maintenance and deployment

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: tinkle-community <tinklefund@gmail.com>

nginx.conf

@@ -0,0 +1,49 @@
+server {
+    listen 80;
+    server_name localhost;
+
+    # Frontend root
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml+rss application/javascript application/json;
+
+    # Frontend routes (SPA)
+    location / {
+        try_files $uri $uri/ /index.html;
+
+        # Cache static assets
+        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+            expires 1y;
+            add_header Cache-Control "public, immutable";
+        }
+    }
+
+    # Proxy API requests to backend
+    location /api/ {
+        proxy_pass http://nofx-trading:8080;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_cache_bypass $http_upgrade;
+        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;
+
+        # Increase timeout for long-running API calls
+        proxy_connect_timeout 300s;
+        proxy_send_timeout 300s;
+        proxy_read_timeout 300s;
+    }
+
+    # Health check endpoint
+    location /health {
+        return 200 "OK\n";
+        add_header Content-Type text/plain;
+    }
+}