data(cpu): import Kaggle unverified specs

[Seungpyo1007]

Summary

• Import Kaggle CPU specification records as unverified seed data.
• Keep benchmark fields null because the Kaggle rank column is an ordering/rank, not a benchmark score.
• Exclude rows with unknown manufacturer/category or names that duplicate existing curated records.
• Remove 5 duplicate GPU records introduced by the previous Kaggle GPU import so strict integrity validation can pass.
• Regenerate the static public dump under site/public.

Source

• https://www.kaggle.com/datasets/lincolnzh/cpu-specifications-dataset

Validation

• python -m app.validate passed
• python ../TechEngine/integrity_check.py data --strict passed

Notes

• All imported CPU records use verified: false.
• This PR uses the reusable data/import-staging branch for future data imports.