feat: add synchronization statistics logging

- Initialize statistics logging in the mirror script
- Update logging to include total, processed, skipped, success, and failed repositories
- Enhance summary report with detailed statistics after synchronization

This commit introduces a comprehensive logging mechanism for the
repository synchronization process. It tracks various metrics such as
total repositories, processed repositories, and their success or failure
status. This enhancement provides better visibility into the
synchronization process and helps in debugging and monitoring.

config.sh

@@ -27,4 +27,8 @@ SKIP_REPOS=${SKIP_REPOS:-"archive,AutoApiSecret, \
                   backup-openbilibili-go-common, \
                   carrot,ChatGLM-6B,dokploy,hub-mirror, \
                   Download-macOS, \
-                  songtianlun,songtianlun.github.io"}
+                  songtianlun,songtianlun.github.io"}
+
+# 系统配置
+LOG_FILE="$LOG_DIR/mirror-$(date '+%Y%m%d-%H%M%S').log"
+STATS_FILE="$LOG_DIR/sync_stats-$(date '+%Y%m%d-%H%M%S').json"