feat(cch): add seeds for Claude Code up to 2.1.146 (#436)

## Summary

Automated cch seed extraction for 1 Claude Code version(s).

- **Versions:** 2.1.146
- **WORKER_VERSION pinned to:** 2.1.146
- **Extracted by:** `scripts/extract-cch-seed.ts`
- **Method:** Oracle pair generation via local capture server + binary
scan

This PR updates `VERSION_SEEDS` and `WORKER_VERSION` in
`packages/gateway/src/cch.ts`
so the gateway can sign billing headers for these Claude Code versions.

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