No module named opentelemetry

# No module named opentelemetry

Reinstall in a clean environment. The reporter's `No module named 'opentelemetry'` after install went away with a clean git checkout and fresh install, which points to a broken or mixed local environment rather than a packaging bug. Practical steps: create a fresh virtualenv (or clean checkout), reinstall logfire there, and run `logfire auth` again.

## Context from the issue
gh:pydantic/logfire#96: Issue pydantic/logfire#96 (closed, 14 comments): ### Description

Got the `No module named 'opentelemetry'` after install and `logfire auth` :

```
❯ poetry add logfire                                                                                                                       
Using version ^0.28.3 for logfire                                                                                                          
                                                                                                                                           
Updating dependencies                                                     ...