Mark deprecated PrimeNG components with TODO comments

For every TS file that imports a component / module deprecated in PrimeNG 18 (TabMenu, Steps, InlineMessage, TabView, pDefer), prepends a TODO comment to the import describing the recommended v18 replacement and writes a row to the ManualMigrationSteps data table. The import itself is left intact — these modules still exist in v18 but their replacements have different APIs that require manual migration.