- Add Hong Kong Transport Department traffic snapshot cameras as a keyless CCTV
  source pack: the public DATA.GOV.HK English locations XML, frames pinned to
  `tdcctv.data.one.gov.hk`, with DATA.GOV.HK Terms of Use attribution. By
  default nearly the full TD catalog (~1,013 cameras; cap 1,100) loads,
  prioritized across Hong Kong Island, Kowloon and the New Territories. Headings
  use the shared id-hash fallback at low confidence. `CCTV_HK_MAX_SOURCES` sets
  the cap (8–1,200) and `CCTV_HK_ENABLED=0` turns the pack off (JCY2515, #990).