chore(logging): remove loguru gzip compression

Delete compression="gz" from both debug and info file sinks so logs
are kept as plain text files. Simplifies log inspection and avoids the
small CPU overhead of nightly gzip compression.

common/logging.py

@@ -48,7 +48,6 @@ logger.add(
     level="DEBUG",  # always full at the file level for audit
     enqueue=True,
     retention="30 days",
-    compression="gz",
     colorize=True,
 )
 
@@ -57,6 +56,5 @@ logger.add(
     level=settings.log_level,
     enqueue=True,
     retention="30 days",
-    compression="gz",
     encoding="utf-8",
 )