fix: use reliable complete ETF history source

[Pigbibi]

Summary

• add Tencent qfq and Yahoo Chart as explicit CN ETF history sources while retaining AkShare compatibility
• publish the complete 21-symbol universe from Tencent qfq after AkShare rejected GitHub runner traffic and Yahoo returned incomplete 511880 history
• fail closed on any missing requested symbol and declare the adjusted-close price basis

Verification

• PYTHONPATH=src python3 -m pytest -q tests/test_akshare_staging.py tests/test_publish_market_history_workflow.py (8 passed)
• real Tencent qfq download: 22,951 rows, all 21 symbols, no short symbol history
• python3 -m ruff check ...
• actionlint .github/workflows/publish-market-history.yml
• git diff --check

[github-actions]

🤖 Codex PR Review

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[Pigbibi]

Review finding analyzed: the existing AkShare path calls fund_etf_hist_em(..., adjust="qfq"), so the established close contract is already adjusted rather than raw exchange close. I kept Yahoo adjclose, made the price basis explicit in diagnostics/code, and added a regression test that distinguishes raw 12.0 from adjusted 10.0. Changing to raw close would be the incompatible behavior here.

[chatgpt-codex-connector]

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