Add uv- prefix to all internal crates (#7853)

## Summary

Brings more consistency to the repo and ensures that all crates
automatically show up in `--verbose` logging.

crates/uv-python/src/prefix.rs

@@ -1,6 +1,6 @@
 use std::path::{Path, PathBuf};
 
-use pypi_types::Scheme;
+use uv_pypi_types::Scheme;
 
 /// A `--prefix` directory into which packages can be installed, separate from a virtual environment
 /// or system Python interpreter.