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/derivedLoadsReports_AA2178_request.json

@@ -0,0 +1,16 @@
+{
+  "structuredQuery": {
+    "from": [{"collectionId": "derivedLoadsReports"}],
+    "where": {
+      "fieldFilter": {
+        "field": {"fieldPath": "flightId"},
+        "op": "EQUAL",
+        "value": {"stringValue": "AA_2178_DFW_2026_04_22"}
+      }
+    },
+    "orderBy": [
+      {"field": {"fieldPath": "createdAt"}, "direction": "DESCENDING"},
+      {"field": {"fieldPath": "__name__"}, "direction": "DESCENDING"}
+    ]
+  }
+}