feat(large_data_validation): evidence/conftest 基础设施 + 门店页/补充用例与单测补全
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infrastructure/evidence.py、conftest.py 基础设施更新；create_company_batch 与 export_validation 规划统计逻辑更新
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standard/shop_page、shop_page_v2 门店页用例；新增 supplemental_60_80 补充用例目录
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新增单测 company_batch_seed / response_artifact / supplemental_brand_details / shop_cases；VALIDATION_GAPS 更新