data(mobile): import PhoneDB variant batch

[Seungpyo1007]

Summary

• import PhoneDB/Kaggle mobile variants into the variant folder layout
• add 2,459 smartphone variant records, 5 tablet records, and 8 mobile SoC stubs
• refresh the published v1 public dump indexes/details for the imported records

Data changes

• Source: https://www.kaggle.com/datasets/sady36/mobile-phones-specs
• All imported records use verified: false for later TechEngine/manual audit.
• Variant records use base_model_slug plus variant fields for region, memory, network, SIM, and model-number grouping.
• Top imported brands include Samsung, Xiaomi, Oppo, Vivo, Huawei, Motorola, ZTE, Apple, Nokia, and OnePlus.

Commit layout

• data(soc): add PhoneDB mobile SoC stubs
• data(mobile): import Samsung Apple and Google variants
• data(smartphone): import BBK group variants
• data(smartphone): import Xiaomi and Huawei variants
• data(smartphone): import remaining PhoneDB variant batch
• chore(site): refresh public dump for PhoneDB variants

Verification

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

Closes #1