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>

padelnomics/litestream.yml

@@ -1,6 +1,4 @@
-# Litestream configuration for SQLite replication
-# Primary replica: Cloudflare R2 (off-host disaster recovery)
-# Secondary replica: local file backup inside the volume
+# Litestream configuration for SQLite replication to Cloudflare R2
 #
 # Set these env vars in .env / GitLab CI variables:
 #   LITESTREAM_R2_BUCKET        e.g. padelnomics-backups
@@ -15,15 +13,9 @@
 dbs:
   - path: /app/data/app.db
     replicas:
-      # Primary: Cloudflare R2
       - url: s3://${LITESTREAM_R2_BUCKET}/padelnomics/app.db
         access-key-id: ${LITESTREAM_R2_ACCESS_KEY_ID}
         secret-access-key: ${LITESTREAM_R2_SECRET_ACCESS_KEY}
         endpoint: https://${LITESTREAM_R2_ENDPOINT}
         retention: 168h
         snapshot-interval: 6h
-
-      # Secondary: local backup inside the volume (fast local restore)
-      - path: /app/data/backups
-        retention: 24h
-        snapshot-interval: 1h