fix: litestream single replica + disable healthcheck gate

v0.5.8 dropped multi-replica support — remove the local path replica,
keeping only R2. Also disable litestream's healthcheck so deploy's
`up --wait` isn't gated on the backup service.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.prod.yml

@@ -34,6 +34,8 @@ services:
     volumes:
       - app-data:/app/data
       - ./padelnomics/litestream.yml:/etc/litestream.yml:ro
+    healthcheck:
+      disable: true
 
   # ── Blue slot ─────────────────────────────────────────────