feat(prod): add production Docker Compose with Caddy SSL (#4)
Single-community production deployment with 6 services:
- PostgreSQL 16 (pgvector), Valkey 8, Tap (firehose), barazo-api,
barazo-web, and Caddy reverse proxy with automatic Let's Encrypt SSL.
Two-network segmentation (frontend/backend), health check dependencies
for startup ordering, restart policies, and commented resource limits.
Caddyfile routes /api/* to API, /docs to API, everything else to Web.
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