feat: use log file creation time in rotated filenames #1
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Summary
This PR updates log rotation to use the creation time of the log file (when it was first opened) as the timestamp in the rotated filename. Previously, the timestamp reflected the moment the file was renamed during rotation.
Why This Matters
Behavior Before
Rotated filename used the time of rotation.
Behavior After
Rotated filename uses the time the log file was created (logStartTime).
Backward Compatibility
Fully backward-compatible. No changes to configuration. The only visible change is the rotated filename format.