fix(venv): honor configured sources in post-install hooks

[m199369309]

Summary

• reuse the virtualenv index_url, extra_index_url, find_links, trusted_host, and index_strategy settings in FlashInfer post-install commands
• keep hook-specific public indexes as online fallbacks without overriding configured package sources
• allow explicit offline installs to use configured private indexes or local find-links while continuing to block public fallback indexes
• pass the resolved virtualenv install configuration to both FlashInfer post-install hooks

Motivation

The main virtualenv installation already honors configured package sources, but the FlashInfer AOT and cubin synchronization hooks invoke uv directly. Those commands previously ignored part or all of the resolved source configuration, which could break private-mirror and offline installations after the main package install had succeeded.

Tests

• pytest -q xinference/core/tests/test_virtual_env_manager.py
• pytest -q xinference/core/tests/test_utils.py
• pre-commit run --files xinference/core/virtual_env_manager.py xinference/core/worker.py xinference/core/tests/test_virtual_env_manager.py

[gemini-code-assist]

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