WS-F #10: a netbird reinstall that adopts a leftover running container
skipped ensure_manifest_certs, so when its data dir was wiped the self-
signed tls.crt/key were never regenerated; the next nginx.conf rewrite +
restart then died on the missing cert (proxy 502, login broken). The
Running branch of ensure_running_with_mode now calls ensure_manifest_certs
before ensure_manifest_files, mirroring prepare_for_start's certs-before-
files ordering. Idempotent: a no-op when crt+key already exist.
Live-validated on .228: deleted netbird tls.crt/key under a Running
container; reconciler regenerated a fresh CN=<host_ip> self-signed cert
(1000:1000), https :8087 = 200.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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