Install palace-manager editable in the container (PP-4076)

[jonathangreen]

Description

Drop --no-editable from the final uv sync in docker/Dockerfile so palace-manager is installed editably in the container — same behavior we had under Poetry.

Motivation and Context

Found while checking the uv changes that rolled out to Minotaur last night. The Poetry → uv migration in #3221 switched the in-container install from editable (Poetry's default) to non-editable (uv sync --no-editable). That change quietly broke palace.manager.scripts.startup's discovery of the startup_tasks/ directory:

Startup tasks directory /var/www/circulation/env/lib/python3.12/startup_tasks does not exist; skipping.

The script resolves STARTUP_TASKS_DIR via Path(__file__).parents[4], which assumes startup.py is at ${root}/src/palace/manager/scripts/startup.py (editable install). Under --no-editable, startup.py lives inside site-packages and parents[4] resolves to env/lib/python3.12/ instead of the project root, so startup_tasks/ is never found.

Restoring the editable install fixes the immediate breakage and matches the previous behavior. It also has the minor side benefit of making in-container debugging easier — you can edit files in place without rebuilding the image.

Future work

Eventually we'd like to build palace-manager as a proper non-editable package that can be published the same way palace-util and palace-opds will be. Several path-resolution issues need to be sorted out first (alembic migrations, startup scripts, and similar file-layout assumptions) before that's feasible. For now, editable install is the simpler and safer choice.

How Has This Been Tested?

• Built the image locally and confirmed startup.py now resolves STARTUP_TASKS_DIR to /var/www/circulation/startup_tasks.
• Existing startup task (2026_02_17_force_re_harvest_all_opds_for_distributors.py) is picked up.

Checklist

• I have updated the documentation accordingly.
• All new and existing tests passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.31%. Comparing base (11171c1) to head (cc02e24).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3245   +/-   ##
=======================================
  Coverage   93.30%   93.31%           
=======================================
  Files         498      498           
  Lines       46147    46147           
  Branches     6318     6318           
=======================================
+ Hits        43059    43060    +1     
  Misses       2003     2003           
+ Partials     1085     1084    -1     

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[tdilauro]

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