Point Google Flights at airline PNG logos

[hqhq1025]

Summary

Updates Google Flights seed data to point at PNG airline logo assets instead of missing SVG paths.

The matching HF asset PR adds all 23 airline logo files referenced by the seeded flights:

• HF asset PR: https://huggingface.co/datasets/ChilleD/WebHarbor/discussions/11
• Asset tarball: google_flights.tar.gz
• Asset tarball sha256: ad4535ca0b30d19844d6d4656c1dc857379e9876febaa708c5d292cffb42f7bc

Logo source pattern checked for every seeded airline:

https://www.gstatic.com/flights/airline_logos/70px/{airline_code}.png

Verification

• Verified all 23 seeded airline logo source URLs return 200 image/png.
• Verified all 23 local files exist under sites/google_flights/static/images/airlines/*.png and have PNG signatures.
• python3 -m py_compile sites/google_flights/app.py sites/google_flights/seed_data.py
• git diff --check
• Packed asset tarball with ./scripts/extract_assets.sh /tmp/webharbor-google-flights-assets google_flights.

Fixes #22.

[Lxr-max]

Superseded by reviewer takeover #136. This PR only rewrote seed_data paths; the published seed DB still stores .svg, and HF discussion #11 is a logos-only tarball.