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refactor(database): optimize `_processForeignKeys()` string allocations and loop invariants (#10351)

* perf: optimize _processForeignKeys()

Refactors _processForeignKeys() to:
- calculate invariant SQL fragments outside the loop
- cache escaped table identifier
- build SQL string locally before concatenating to the array, saving intermediate string allocations

* refactor: apply code review fixes for _processForeignKeys optimization

- Restore fast return without foreign keys\n- Remove unrelated formatting changes\n- Remove non-English comment

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