Move offer asset resolution into Rust engine

[hoffmang9]

Summary

• Move offer asset normalization and Coinset fallback into the Rust engine with a single Python bridge (offer_assets_bridge).
• Compose normalize-then-Coinset once in Python; expose coinset-only resolution as resolve_offer_assets_via_coinset (deprecated resolve_offer_asset_ids alias retained).
• Align BLS and signer action builds on the same asset-resolution path when signer config is available; remove duplicate Python checks and dead adapter wrappers.

Test plan

• pre-commit run --all-files (ruff, pyright, full pytest)
• tests/test_offer_assets_bridge.py — real-engine normalize, collision, composition, and coinset fallback
• Rust cargo test action:: including mockito coinset ticker resolution
• Rebuild PyO3 extension in CI (maturin develop) before merge if not already in pipeline

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