refactor(logfiles): fix and optimize log search with binary I/O

Rewrite log search functions to use binary I/O and byte offsets for
improved speed and correctness. This includes precise line boundary
handling, efficient regex matching on bytes, and decoding only matched
lines. The look-back error suppression logic is now handled with
compiled byte regex pairs, and seek offsets are validated for safety.
These changes improve performance and reliability when processing large
log files and rotated logs.

Author: mkoura