Add logo URL checker script

[rursache]

Summary

• Adds scripts/check_logos.py — an async Python script that scans data/logos.csv and identifies broken logo URLs
• Adds dead_logos*.json to .gitignore so output files are never accidentally committed

How it works

A logo URL is considered dead if:

• The connection fails or times out
• The HTTP response is not 2xx
• The Content-Type is not image/*

429 responses are retried with exponential backoff (respects Retry-After header). HEAD requests fall back to GET automatically on 405.

Usage

# pip install aiohttp

# Full scan (~40k URLs)
python3 scripts/check_logos.py

# Re-check a previous result with lower concurrency to avoid rate limits
python3 scripts/check_logos.py --recheck dead_logos.json --concurrency 10 --delay 500

# Keep re-checking until the dead list stabilizes
python3 scripts/check_logos.py --recheck dead_logos.json --loop --concurrency 10 --delay 500

Output is a JSON array of dead logo entries (all original CSV fields preserved) with an added _reason field explaining why the URL failed.

Requires: Python 3.10+, aiohttp

[rursache]

example of the resulting dead_logos.json file:

Reason breakdown:
        55  HTTP 404
        33  connection error
        26  HTTP 403
        15  bad content-type
        14  other
        14  timeout
         2  HTTP 409
         1  HTTP 521
         1  HTTP 402
         1  HTTP 400
         1  HTTP 502
         1  HTTP 500

dead_logos.json

[BellezaEmporium]

I'm not against the idea, but since most of the scripts' codes are in JS (via Node), i'll see if @freearhey 's in for adding a Python script.