docs: Update testing outcomes and future improvement roadmap

[ManupaKDU]

This commit updates the Jules/improvements.md and .zektopic/status.md documentation files with the final results of the local testing environment execution and a detailed future implementations roadmap. It outlines Pydantic v2 mock improvements, backend test limitations, Vitest module isolation improvements, and database batch-query optimization recommendations.

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PR created automatically by Jules for task 13739927666471091216 started by @manupawickramasinghe

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