fix(backend): atomic & resumable content import - #403
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Run the puzzle migration inside a single DB transaction so a failure mid-batch rolls back every row instead of leaving partial categories, puzzles, dependencies, or rewards persisted. - wrap migratePuzzles in dataSource.transaction via the shared manager - abort + roll back the entire batch on any insertion error (e.g. an in-batch duplicate violating the unique (title, category) index) - skip pre-existing rows so re-running the same upload is idempotent - surface a rolledBack flag on MigrationResult and report zero inserts after a rollback (nothing was actually persisted) - add rollback and restart unit tests Closes UnityChainxx#271
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Closes #271