feat(data/smartphone): add Wikipedia URLs for 8 verified smartphones

[Seungpyo1007]

Closes #1

Summary

Cross-referenced unverified smartphone records (batch 17, 300 sampled records with no overlap against the 4,600 records judged in batches 1-16) against English Wikipedia using exact heading matching and multi-spec verification safeguards.

Verification Results

• Evaluated: 300 sampled smartphone records across 106 brands
• CONFIRM: 8
• AMBIGUOUS: 9
• NOTFOUND: 276
• CONTRADICT: 7

Safeguard Details

• Exact heading match required (_heading_matches)
• Required at least two independent agreeing specifications (launch year alone is blocked)
• Hard-gated variant confusion filters (Pro, Max, Ultra, Mini, Lite, 4G vs 5G, etc.)
• Year-only confirms: 0
• Confirmed records:
  • Itel A70 (128GB) -> https://en.wikipedia.org/wiki/Itel_A70
  • YU Yureka -> https://en.wikipedia.org/wiki/YU_Yureka
  • Google Pixel 3 -> https://en.wikipedia.org/wiki/Google_Pixel_3
  • Huawei G6600 Passport -> https://en.wikipedia.org/wiki/Huawei_G6600_Passport
  • Nokia 9110i Communicator -> https://en.wikipedia.org/wiki/List_of_Nokia_products#4-digit_series
  • A40 -> https://en.wikipedia.org/wiki/Siemens_A40
  • MX4 Pro -> https://en.wikipedia.org/wiki/Meizu_MX4_Pro
  • Treo 750 -> https://en.wikipedia.org/wiki/Palm_Treo_750

GSMArena, PhoneDB, DeviceSpecifications, and Namuwiki were not requested.