Configure nginx to proxy API and WebSocket requests to backend.
This allows the frontend to work on VMs without hardcoded localhost URLs.
Changes:
- nginx.conf: Added proxy rules for /api/, /ws, and /health
- client.ts: Use relative URLs in production mode
- websocket.ts: Dynamically construct WebSocket URL based on current host
This fixes ERR_BLOCKED_BY_CLIENT and connection issues on VMs.
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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