.Csv added to EP URLs

[joannekoch]

These changes include:

1. .csv added to EP URLs when downloading a file
2. Special bottle processing for AR28b, AR24a, and AR39a
3. No nutrient data generated for AR78
4. Added Underway Column Definitions for AE2426
5. Updated Automated Tests accordingly.

[Copilot]

Pull request overview

This PR updates multiple NES-LTER API “download” endpoints to use .csv-suffixed URLs (and adds/adjusts a few related data-handling rules), then updates the automated test suite and landing-page links to match.

Changes:

• Updated many API routes and UI links to use .csv for file downloads (CTD, Underway, Events, Nut, Chl, HPLC, Stations).
• Added/adjusted special-case data handling: extra bottle metadata handling for select cruises, skip nutrient flag generation for AR78, and add AE2426 underway column definitions.
• Updated automated tests to validate the new .csv endpoints and some new/adjusted outputs.

Reviewed changes

Copilot reviewed 28 out of 29 changed files in this pull request and generated 14 comments.

Show a summary per file

File	Description
tests/vessels.js	Adds coverage for new vessels CSV download endpoint.
tests/underway.js	Switches underway data + column definition file checks to .csv and updates AE2426 column-definition expectations.
tests/station.js	Updates stations file download to /file.csv.
tests/nut.js	Switches nutrient endpoints to .csv, updates expected counts, adds AR52 samplelog CSV test.
tests/niskin.js	Adds niskins CSV download test and updates JSON field expectation (niskin_number).
tests/metadata.js	Switches CTD metadata to .csv and adds bathymetry CSV test.
tests/landing.js	Updates landing-page link targets to .csv for file downloads and adjusts window-handle switching.
tests/hplc.js	Updates HPLC fetch to .csv.
tests/event.js	Updates events fetch to .csv.
tests/cruise.js	Adds cruises CSV test and keeps JSON “all cruises” test.
tests/chl.js	Updates chlorophyll endpoints to .csv.
tests/cast.js	Adds casts CSV “all” test and updates single-cast download to .csv.
tests/bottle.js	Updates bottles + bottle_summary downloads to .csv.
api/underway/services.py	Adds AE2426 underway column definitions and introduces JSON column-definition support alongside CSV.
api/underway/api.py	Adds /column_definition/{cruise}.csv and changes underway data route to /{cruise}.csv.
api/stations/api.py	Renames stations file route to /file.csv.
api/nut/services.py	Changes AR52 nutrient samplelog merging approach.
api/nut/management/commands/importnut.py	Skips nutrient flag generation for ar78.
api/nut/api.py	Renames nutrient routes to .csv.
api/hplc/api.py	Renames HPLC route to .csv.
api/events/api.py	Renames events route to .csv.
api/ctd/services.py	Adds JSON responses for vessels/cruises “all”, adds CSV endpoints for vessels/cruises/casts/niskins, renames NiskinOutput field.
api/ctd/management/commands/importniskin.py	Adds special-case handling for cruises missing bottle metadata (AR28B/AR24A/AR39A).
api/ctd/api.py	Adds/renames CTD routes for CSV downloads (vessels/cruises/casts/cast/niskins/bottles/metadata/bathymetry).
api/core/utils.py	Adjusts missing-.btl handling logic in read_nut_data.
api/core/templates/cruise_list.html	Updates landing page links to .csv download URLs.
api/chl/api.py	Renames chlorophyll routes to .csv.
.github/workflows/publish-image-api.yml	Changes workflow branch trigger list.

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[joannekoch]

Made copilot suggested changes and pushed up to csv branch. Ready to merge.