fix: skip valkey-glide on Windows

[RockChinQ]

Summary

• mark valkey-glide as a non-Windows dependency and refresh uv.lock
• keep the Valkey Search backend optional when the client is unavailable
• make Valkey tests skip safely without glide and document Windows support

Root cause

The Valkey Search integration added valkey-glide as an unconditional direct dependency. The published package provides macOS and manylinux wheels but no Windows wheel, so Windows installs fall back to a source build and fail.

Impact

LangBot can be installed normally on Windows without valkey-glide. The Valkey Search backend remains automatically available on supported platforms and reports a clear error if selected where the client is unavailable.

Validation

• uv lock --check
• Windows dependency resolution excludes valkey-glide
• Linux dependency resolution includes valkey-glide
• 45 passed, 10 skipped for the related vector tests
• ruff check on the changed Python files
• git diff --cached --check

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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