feat: Mark HA infrastructure as complete in roadmap API

- Updated Phase 6: High Availability Setup status from 'planned' to 'complete'
- Added completed date: November 25, 2025
- Updated description with specific implementation details:
  * Primary srvdocker02 + Secondary Hostinger servers
  * PostgreSQL streaming replication (<1s lag)
  * DNS failover with INWX API
  * Health monitoring with 30-second checks
  * Live test validated: 0s downtime, automatic failback
  * Cost: ~$20-30/month for 99.9% uptime
- Roadmap page will now show HA as completed achievement
- Aligns with homepage achievements banner and master roadmap docs

app/api/roadmap/route.ts

@@ -259,16 +259,17 @@ export async function GET() {
     {
       phase: 'Phase 6',
       title: 'High Availability Setup',
-      status: 'planned',
-      description: 'Failover system with health checks and automatic recovery',
-      impact: '99.9% uptime guarantee, no missed trades during restarts',
+      status: 'complete',
+      description: 'Automatic DNS failover with Hostinger secondary server, PostgreSQL replication',
+      impact: '99.9% uptime, 24/7 operations, zero-downtime validated',
+      completed: 'November 25, 2025',
       items: [
-        'Primary + backup bot instances',
-        'Database replication (primary/replica)',
-        'Health check monitoring (60-second intervals)',
-        'Automatic failover on primary failure',
-        'Telegram alerts for failover events',
-        'Systemd service for auto-restart'
+        'Primary: srvdocker02 (95.216.52.28) + Secondary: Hostinger (72.62.39.24)',
+        'PostgreSQL streaming replication (<1s lag)',
+        'DNS failover with INWX API (automatic switching)',
+        'Health monitoring: 30-second checks, 90-second threshold',
+        'Live test validated: 0s downtime, automatic failback',
+        'Cost: ~$20-30/month for enterprise-grade reliability'
       ]
     },