django-countries dependency missing

[momorientes]

On a clean venv, I tried installing via uv:

user@system » uv add peeringdb
Resolved 23 packages in 657ms
Prepared 16 packages in 159ms
Installed 17 packages in 11ms
 + anyio==4.12.0
 + certifi==2025.11.12
 + charset-normalizer==3.4.4
 + click==8.3.1
 + confu==1.9.0
 + h11==0.16.0
 + httpcore==1.0.9
 + httpx==0.28.1
 + idna==3.11
 + munge==1.4.0
 + peeringdb==2.4.1
 + pyyaml==6.0.3
 + requests==2.32.5
 + toml==0.10.2
 + tomlkit==0.13.3
 + twentyc-rpc==1.0.0
 + urllib3==2.5.0
user@system » uv run peeringdb server --setup
Traceback (most recent call last):
  File "/Users/mf/work/edgeops/crm/.venv/bin/peeringdb", line 4, in <module>
    from peeringdb.cli import main
  File "/Users/mf/work/edgeops/crm/.venv/lib/python3.13/site-packages/peeringdb/cli.py", line 6, in <module>
    from peeringdb import commands, config
  File "/Users/mf/work/edgeops/crm/.venv/lib/python3.13/site-packages/peeringdb/commands.py", line 12, in <module>
    from peeringdb.output._dict import dump_python_dict
  File "/Users/mf/work/edgeops/crm/.venv/lib/python3.13/site-packages/peeringdb/output/_dict.py", line 9, in <module>
    import django_countries.fields
ModuleNotFoundError: No module named 'django_countries'

Manually installing django_countries fixed the problem:

user@system » uv add django_countries                                                                                    
Resolved 25 packages in 177ms
Prepared 2 packages in 418ms
Installed 2 packages in 12ms
 + django-countries==8.2.0
 + typing-extensions==4.15.0

I don't fully understand the packaging, hence I can't produce a PR.