[WIP] Downloads taking longer than ~20s cause server to crash

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

See error logs

5:44 PM
[2025-07-31 17:44:36 +0800] [1586311] [INFO] Worker initialized
python3
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[2025-07-31 17:44:36 +0800] [1586311] [INFO] Booting worker with pid: 1586311
python3
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[2025-07-31 17:44:36 +0800] [1585362] [INFO] Worker spawned (pid: [booting])
python3
5:44 PM
[2025-07-31 17:44:36 +0800] [1585366] [INFO] Worker exiting (pid: 1585366)
python3
5:44 PM
127.0.0.1 - - [31/Jul/2025:17:44:36 +0800] "GET /api/download/36 HTTP/1.1" 500 0 "-" "-"
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SystemExit: 1
python3
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sys.exit(1)
python3
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File "/home/josh/.local/lib/python3.12/site-packages/gunicorn/workers/base.py", line 204, in handle_abort
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time.sleep(sleep_time)
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File "/mnt/data/AFHArchive/app/utils/rate_limiter.py", line 38, in read
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^^^^^^^^^^^^^^^^^^^^^^^^
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chunk = limited_file.read(65536)
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File "/mnt/data/AFHArchive/app/routes/api.py", line 50, in generate
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for item in iterable:
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File "/home/josh/.local/lib/python3.12/site-packages/werkzeug/wrappers/response.py", line 32, in _iter_encoded
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^^^^^^^^^^^^
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return self._next()
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File "/home/josh/.local/lib/python3.12/site-packages/werkzeug/wsgi.py", line 256, in __next__
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for item in respiter:
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File "/home/josh/.local/lib/python3.12/site-packages/gunicorn/workers/sync.py", line 182, in handle_request
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self.handle_request(listener, req, client, addr)
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File "/home/josh/.local/lib/python3.12/site-packages/gunicorn/workers/sync.py", line 134, in handle
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Traceback (most recent call last):
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[2025-07-31 17:44:36 +0800] [1585366] [ERROR] Error handling request /api/download/36
python3
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127.0.0.1 - - [31/Jul/2025:17:44:36 +0800] "GET /api/download/36 HTTP/1.1" 200 49414144 "https://afh.joshattic.us/file/36" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36"
python3

This is caused by server handling downloads synchronously, we need to do them asyncronously

Fixes #8.

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