Airline integration work: AirlineLoadService updates, docs, JSX scripts

- AirlineLoadService: pass airport DB for timezone-aware date strings,
  add browser-shaped headers for United, expand JetBlue/Alaska/Emirates
  signatures to take origin, log/parse fixes for Korean Air.
- FlightsApp: build AirlineLoadService with the airport DB and inject it.
- JSX: continued WebView-based fetcher work plus updated JSX_NOTES.
- Docs: add AIRLINE_INTEGRATION_GUIDE.md, drop the old AIRLINE_API_SPEC.md,
  add api_docs/ (StaffTraveler reverse-engineering captures + findings).
- Scripts: jsx_cdp_probe, jsx_live_monitor, jsx_swift_smoke for JSX
  protocol exploration.
- .gitignore: exclude airlines/ (local-only APK/IPA reverse-engineering).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

api_docs/stafftraveler_captures/createLoadsRequests_AA2178_response.json

@@ -0,0 +1 @@
+{"payload":{"numberOfRequests":0,"verifiedRequests":[{"flightId":"AA_2178_DFW_2026_04_22","isExisting":true,"isDuplicateForUser":true,"isRequestUpdateForUser":false,"hasDeparted":false,"isCancelled":false,"isPriorityRequest":false,"hasRecentLoads":false,"scheduledFlight":{"id":"a23d6f8379f5109eddeb5bbf78bdccc1","id_v2":"0d9d0702b203d224ace3e6eb94531dde","id_v3":"AA_2178_DFW_2026_04_22","airlineId":"AA","flightCode":"AA2178","flightNumber":2178,"departureAirportId":"DFW","arrivalAirportId":"LAS","departureTimeLocal":"2026-04-22T16:45:00-05:00","arrivalTimeLocal":"2026-04-22T17:46:00-07:00","departureTimeUtc":"2026-04-22T21:45:00Z","arrivalTimeUtc":"2026-04-23T00:46:00Z","flightEquipmentId":"32Q","durationMinutes":181,"isCargoFlight":false,"isPriorityRequest":false,"airlineStCode":"st_AAL","departureAirportIata":"DFW","arrivalAirportIata":"LAS","flightEquipmentIata":"32Q","seatsTotal":196,"seatsByClass":{"first":0,"business":20,"premiumEconomy":0,"economy":176}}}],"hasSufficientCredits":true,"numberOfRequestsPaidFor":0,"numberOfRequestsPaidForPriority":0}}