* docs: document gateway.log_level in all READMEs and i18n configuration docs
Add gateway log level note to Channels section in all 9 READMEs and
add Gateway Log Level section to zh/fr/ja/pt-br/vi configuration docs.
- gateway.log_level (default: fatal) controls log verbosity
- Supported values: debug, info, warn, error, fatal
- Can also be set via PICOCLAW_LOG_LEVEL env var
- English docs/configuration.md already had this section
* fix(docs): correct gateway.log_level default from fatal to warn
DefaultConfig() sets Gateway.LogLevel to "warn", not "fatal".
Update all READMEs and i18n configuration docs to reflect the
actual default value.
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Co-authored-by: BeaconCat <BeaconCat@users.noreply.github.com>
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