feat: add upgrade and migration flow for native fnOS

havline/cmd/upgrade_callback

@@ -1,6 +1,9 @@
 #!/bin/bash
 set -euo pipefail
 
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+source "$SCRIPT_DIR/migrate_legacy.sh"
+
 if [ -f "$TRIM_PKGVAR/havline.db" ] && [ ! -r "$TRIM_PKGVAR/havline.db" ]; then
   echo "数据库不可读：$TRIM_PKGVAR/havline.db" > "$TRIM_TEMP_LOGFILE"
   exit 1
@@ -11,4 +14,7 @@ if [ -f "$TRIM_PKGVAR/session_secret" ] && [ ! -r "$TRIM_PKGVAR/session_secret"
   exit 1
 fi
 
+migrate_legacy_data
+backup_database
+
 exit 0