data(mobile): import AIToolBuzz device records

[Seungpyo1007]

Summary

• import AIToolBuzz mobile records from Kaggle (devadigax/awesome-mobiles-database-by-aitoolbuzz-com)
• add 676 smartphones, 131 tablets, and 18 watches with verified: false
• preserve source links, images, memory/network/model-number variant fields where available
• refresh the published v1 dump for imported smartphones/tablets/watches

Import policy

• Source: https://www.kaggle.com/datasets/devadigax/awesome-mobiles-database-by-aitoolbuzz-com
• Imported records remain verified: false until manual/TechEngine verification.
• Rows with missing release dates, missing required metrics, invalid numeric ranges, unknown brands, or unmapped smartphone SoCs were skipped.
• Smartphone records with fractional RAM were skipped because the current smartphone API schema expects integer ram_gb.

Verification

• python -m app.validate PASS
• python TechEngine\integrity_check.py data --strict PASS
• git diff --check origin/main...HEAD PASS
• cd site && npm.cmd run build PASS

Closes #1