del extern alloc

remove bindings from workspace and Dockerfile

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

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fix #11: Manifest::removeMeta() empty collection handling

- Fixed removeMeta() to convert empty Object and Array to null
- Updated DBAdapter connection pooling with tag-based naming
- Removed unused adapter methods (clear, keys, has, get_all, ttl)
- Updated Quick Start example in README

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