Update .gitignore and fix audit paths to use standard Linux directories

- Add comprehensive runtime file patterns to .gitignore (data/, config/, logs/, production/, *.log, *.db, *.db-wal, *.db-shm)
- Keep *.example files tracked for configuration templates
- Update CLI audit command to use FHS-compliant paths (/var/lib/aitbc, /etc/aitbc, /var/log/aitbc)

.gitignore

@@ -333,3 +333,14 @@ backups/*/logs/
 # ===================
 monitoring/*.pid
 systemd/*.backup
+data/
+config/
+logs/
+production/data/
+production/logs/
+*.log
+*.log.*
+*.db
+*.db-wal
+*.db-shm
+!*.example