chore(attic): removed obsolete kv, http, and vm crates from attic

- Removed tetra-kv crate with RocksDB, LMDB, and in-memory storage backends.
- Removed HTTP client/server modules including SSE and WebSocket implementations.
- Removed vm crate containing JavaScript interpreter prototype.
- Removed vmi-precompile crate for bundled Wasm modules.
- Added pyproject.toml and updated package.json to use uv for Python environment management.