fix: 4 additional release-consistency findings

- Disable healthcheck on probe compose services (no HTTP server)
- Remove stale "(Phase 4)" comment from dev compose
- Add data/ to .gitignore (compose volume creates deploy/data)
- Clarify -db-type flag help text (sqlite or postgres)

.gitignore

@@ -25,4 +25,5 @@ authorized_keys
 tmp
 *.local.json
 *.local.md
+data/
 .env