refactor: add unified entrypoints and runtime adapters

[Pigbibi]

Summary

• add live-profile manifests and unified entrypoints for us_equity strategies
• add IB runtime adapters for migration-window strategy metadata
• cover the new entrypoint and adapter path with regression tests

Test Plan

• python3 -m py_compile src/us_equity_strategies/runtime_adapters.py src/us_equity_strategies/init.py tests/test_entrypoints.py
• python3 -m ruff check src/us_equity_strategies/runtime_adapters.py src/us_equity_strategies/init.py tests/test_entrypoints.py
• source /tmp/ues-strategy-contract-venv13/bin/activate && PYTHONPATH=src:/Users/lisiyi/Projects/QuantPlatformKit/src python -m unittest tests.test_entrypoints -v