fix(gamedata): log fio transport errors at warning in refresh tasks

[jplacht]

What and why

Found by /error-review: during an FIO slowdown, 58 planet_refresh_failed events in 24h were httpx.ReadTimeouts logged at error level with a traceback. The failure is expected and already handled (the planet is retried after 15 minutes, and fio_request_failed logs the timeout as a warning), so the error level only flooded the error views.

Changes

• gamedata_refresh_planet and gamedata_refresh_user_fiodata: httpx.TransportError (timeouts, dropped connections, RemoteProtocolError) now goes to a logger.warning branch next to the existing HTTPStatusError one. Event names and fields unchanged; update_refresh_result(error=...) retry bookkeeping unchanged. Anything else still goes to logger.exception.
• Tests: a ReadTimeout case in both log-level tests; the planet test also asserts the row is retrying with error_count == 1 and a next_retry_at.
• CLAUDE.md: the refresh-failure logging rule now mentions transport errors.

Timeouts are unchanged. gamedata_refresh_planet_infrastructure and gamedata_refresh_cxpc keep logging every failure with logger.exception (they have no warning branch today).

How it was verified

• uv run ruff check, uv run ruff format --check, uv run ty check --exclude "**/migrations/*.py": pass
• uv run pytest: 813 passed; the two new ReadTimeout cases fail without the fix

Closes #75

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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🟢 Metrics 0 complexity · 0 duplication

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Duplication	0

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🟢 Coverage 100.00% diff coverage · +0.00% coverage variation

Metric	Results
Coverage variation	✅ +0.00% coverage variation (-1.00%)
Diff coverage	✅ 100.00% diff coverage

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Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (93510e8)	4891	4681	95.71%
Head commit (9114fb5)	4895 (+4)	4685 (+4)	95.71% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#76)	4	4	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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