Accept arXiv categories and list URLs

[user1303836]

Summary

• accept raw arXiv category identifiers like cs.AI when adding sources
• normalize arXiv list and RSS URLs to canonical category identifiers
• validate the derived arXiv RSS feed URL instead of rejecting non-HTTP category input

Why

/source add currently rejects valid arXiv category input such as cs.AI before arXiv-specific parsing runs, even though the adapter expects category identifiers. It also accepts list URLs poorly by treating them as raw identifiers.

Verification

• /Users/user1303836/Development/intelstream/.venv/bin/ruff check .
• /Users/user1303836/Development/intelstream/.venv/bin/ruff format --check .
• /Users/user1303836/Development/intelstream/.venv/bin/mypy src/
• PYTHONPATH=/Users/user1303836/Development/intelstream/src /Users/user1303836/Development/intelstream/.venv/bin/pytest -q

[greptile-apps]

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