feat(genvm): vendor leader public data codec

[kp2pml30]

Delivery context

Depends-On: genlayerlabs/genvm-manager#29

What

• Vendors the GenVM LeaderPublicData type and same-as-node byte codec into Studio's Python host
• Wires opaque leader public data through the manager request and result paths
• Updates the GenVM pin and existing contract fixtures to the matching Python runner

I plan to make one more PR that will change the encoding, for now it is the same as was in the node before

Why

• Keeps Studio compatible with the GenVM manager after leader-output encoding ownership moves into the executor
• Preserves the current encoding and fee behavior

Testing done

• Existing adapted unit suite passed
• Existing company-naming and storage integration coverage passed
• Black, Ruff, and repository pre-commit hooks passed
• Independent audit confirmed 0 added test files or test functions and no unrelated deletions

Decisions made

• Vendored the upstream origin implementation directly; Studio-specific address handling remains unchanged
• Kept decoding explicit through from_bytes rather than constructor behavior

Checks

• I have tested this code
• I have reviewed my own PR
• I have created an issue for this PR
• I have set a descriptive PR title compliant with conventional commits

Reviewing tips

Compare backend/node/genvm/origin/leader_public_data.py with the GenVM manager's Python host source, then follow the value through backend/node/genvm/base.py

User facing release notes

No user-facing behavior change; this is a GenVM compatibility update

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