fix(certs): replace encrypted CA with unencrypted ECDSA P-256 CA

- Replaced password-protected RSA CA with unencrypted ECDSA P-256 CA
  to prevent manager startup failures from encrypted keys.
- Regenerated server and client certificates (client001) with new CA.
- Updated CA_SETUP.md to use openssl genpkey (unencrypted) instead of
  openssl genrsa -aes256, with warning against encrypted keys.

configs/certs/ca.pem

@@ -1,31 +1,12 @@
 -----BEGIN CERTIFICATE-----
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+lfK+SS8=
 -----END CERTIFICATE-----