Fix symlink preservation in virtual environment creation (#14933)
## Summary
Fixes inconsistent symlink handling in `uv venv` command (#14670).
## Problem
https://github.com/astral-sh/uv/blob/00efde06b61756f0f305fcf67b12db71a29063d3/crates/uv-virtualenv/src/virtualenv.rs#L81
The original code used `Path::metadata()` which automatically follows
symlinks, causing the system to treat symlinked virtual environment
paths as regular directories. When a user runs uv venv on an existing
symlinked virtual environment `(.venv -> foo)`, the code incorrectly
treats the symlink as a regular directory because `location.metadata()`
automatically follows the symlink and returns metadata for the target
directory `foo/`. This causes the removal logic to delete the symlink
itself and permanently breaking the symlink relationship and replacing
it with a standard directory structure.
## Solution
- Use canonicalize() to resolve symlinks only when removing and
recreating virtual
environments
- This ensures operations target the actual directory while preserving
the symlink
structure
- Minimal change that fixes the core issue without complex path
management
## Test Plan
```bash
➜ test-env alias uv-dev='/Users/wingmunfung/workspace/uv/target/debug/uv'
➜ test-env ln -s dummy foo
➜ test-env ln -s foo .venv
➜ test-env ls -lah
total 0
drwxr-xr-x 4 wingmunfung staff 128B Jul 30 10:39 .
drwxr-xr-x 48 wingmunfung staff 1.5K Jul 29 17:08 ..
lrwxr-xr-x 1 wingmunfung staff 3B Jul 30 10:39 .venv -> foo
lrwxr-xr-x 1 wingmunfung staff 5B Jul 30 10:39 foo -> dummy
➜ test-env uv-dev venv
Using CPython 3.13.2
Creating virtual environment at: .venv
error: Failed to create virtual environment
Caused by: failed to create directory `.venv`: File exists (os error 17)
➜ test-env mkdir dummy
➜ test-env uv-dev venv
Using CPython 3.13.2
Creating virtual environment at: .venv
Activate with: source .venv/bin/activate
➜ test-env ls -lah
total 0
drwxr-xr-x 5 wingmunfung staff 160B Jul 30 10:39 .
drwxr-xr-x 48 wingmunfung staff 1.5K Jul 29 17:08 ..
lrwxr-xr-x 1 wingmunfung staff 3B Jul 30 10:39 .venv -> foo
drwxr-xr-x 7 wingmunfung staff 224B Jul 30 10:39 dummy
lrwxr-xr-x 1 wingmunfung staff 5B Jul 30 10:39 foo -> dummy
➜ test-env uv-dev venv
Using CPython 3.13.2
Creating virtual environment at: .venv
✔ A virtual environment already exists at `.venv`. Do you want to replace it? · yes
Activate with: source .venv/bin/activate
➜ test-env ls -lah
total 0
drwxr-xr-x 5 wingmunfung staff 160B Jul 30 10:39 .
drwxr-xr-x 48 wingmunfung staff 1.5K Jul 29 17:08 ..
lrwxr-xr-x 1 wingmunfung staff 3B Jul 30 10:39 .venv -> foo
drwxr-xr-x@ 7 wingmunfung staff 224B Jul 30 10:39 dummy
lrwxr-xr-x 1 wingmunfung staff 5B Jul 30 10:39 foo -> dummy
### the symlink still exists
```
---------
Co-authored-by: Zanie Blue <contact@zanie.dev>
