Show the equivalent curl request for every interactive example in the…

[PradeepJaiswar]

Summary

• Every interactive example in the Streamlit app now shows the equivalent curl request(s) for
  its underlying SDK call(s), so users can see exactly what HTTP request the SDK sent and try it
  standalone.
• Added a right-aligned "See the executed curl request ↓" link next to each example's action
  button that jumps to the curl block below the results.
• utils.build_curl() gained extra_headers support (needed for the older v2 market-quote
  endpoints' required Api-Version header).
• Loops that fire many near-identical calls (options chains, OI/gamma strike sweeps, etc.) show
  one representative call with a note stating the real request count, instead of dozens of
  duplicate blocks.
• The 3 WebSocket-only examples (Live Depth 5-level / MCX / USDINR) are unaffected — they stop
  before any button or API call since live streaming isn't supported in the web UI.
• Scope is Streamlit-only: instrument_search/search_equity.py (the CLI counterpart) briefly
  gained the same curl-print output and has been reverted back to its original behavior, so this
  CLI script ends up unchanged.