atomic_yaml_write() and atomic_json_write() used tempfile.mkstemp()
which creates files with 0o600 (owner-only). After os.replace(), the
original file's permissions were destroyed. Combined with _secure_file()
forcing 0o600, this broke Docker/NAS setups where volume-mounted config
files need broader permissions (e.g. 0o666).
Changes:
- atomic_yaml_write/atomic_json_write: capture original permissions
before write, restore after os.replace()
- _secure_file: skip permission tightening in container environments
(detected via /.dockerenv, /proc/1/cgroup, or HERMES_SKIP_CHMOD env)
- save_env_value: preserve original .env permissions, remove redundant
third os.chmod call
- remove_env_value: same permission preservation
On desktop installs, _secure_file() still tightens to 0o600 as before.
In containers, the user's original permissions are respected.
Reported by Cedric Weber (Docker/Portainer on NAS).
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