Fix Schwab market data transient retries

[Pigbibi]

Summary\n- retry Schwab market data requests on HTTP 429 and transient 5xx responses\n- respect Retry-After with bounded exponential backoff\n- bump package version to v0.7.37\n\n## Tests\n- PYTHONPATH=src python -m unittest tests.test_schwab_market_data\n- python -m compileall -q src/quant_platform_kit/schwab/market_data.py tests/test_schwab_market_data.py\n- python -m ruff check src/quant_platform_kit/schwab/market_data.py tests/test_schwab_market_data.py

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep package version declarations in sync

Bumping only the PEP 621 version leaves setup.py and quant_platform_kit.__version__ at 0.7.36, while tests/test_package_version.py explicitly asserts both declarations match pyproject.toml. In any environment that runs the full package test suite or builds via the legacy setup.py path, this commit reports inconsistent package versions and fails the version consistency test.

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