security: harden Syslog output and imports#326
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Summary\n- escape stored alert content before guest-accessible rendering\n- prevent spreadsheet formula execution in CSV exports\n- cap imported XML payloads before reading them into memory\n\n## Validation\n- PHP syntax checks for changed sources and regression test\n- issue318_output_import_hardening_test.php\n\n## Compatibility\nUses PHP 7.4-compatible syntax and Cacti helper conventions.