fix(AVO-4098): show subtitles after upload, align sub flow with original

[bertyhell]

https://meemoo.atlassian.net/browse/AVO-4098

Rework some subtitle upload code to align more with how the flow was before the upgrades/speechmatics track, since subtitles worked there, but not in the latest version

some code in mediahaven_api.py has been removed, to use the original code in ftp_uploader.py

after uploading, ensure the route:
http://localhost:8080/item_subtitles/testbeeld/qszg6jq77n/closed
correctly serves a vtt version of the subtitles (content type text/vtt)

then load the subtitles into the flowplayer tracks

[Copilot]

Pull request overview

This PR reworks the subtitle upload/playback flow to better match the pre-upgrade behavior, aiming to ensure uploaded subtitles are available as VTT via /item_subtitles/... and are loaded into Flowplayer tracks.

Changes:

• Switch subtitle upload from MediaHaven API upload logic to FTP-based upload via FtpUploader.
• Serve VTT subtitles with an explicit text/vtt content type and update Flowplayer setup to load available subtitle track types.
• Add a Docker named volume for subtitle_uploads and adjust test skip reasons for VCR/live MediaHaven dependency.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/test_app.py	Updates skip reasons for tests that require live MediaHaven/VCR recording.
docker-compose.yml	Adds a named volume for subtitle uploads (currently mounted to the wrong service; see comments).
docker-compose.develop.yml	Mounts the subtitle uploads named volume in development.
app/templates/metadata/edit.html	Builds Flowplayer subtitle tracks dynamically from available subtitle types.
app/services/mediahaven_api.py	Removes API-based subtitle upload/delete methods in favor of FTP flow.
app/redactietool.py	Sets VTT response content type; switches subtitle upload path to FtpUploader; removes /delete_subtitle route.
.gitignore	Adds app/subtitle_uploads/ (and also AGENTS.md, which likely isn’t intended).

Comments suppressed due to low confidence (1)

app/redactietool.py:423

• The /delete_subtitle endpoint was removed, but the UI still calls it when the user deletes an existing subtitle (see app/templates/metadata/sections/subtitle_section.html, fetch('/delete_subtitle', ...)). This will now 404 and leave the UI in a broken state. Either restore /delete_subtitle (and the underlying MediaHaven delete call) or update the frontend to remove/disable the delete action.

@app.route('/subtitle_files', methods=['GET'])
@login_required
def get_subtitle_files():
    pid = request.args.get('pid')
    department = request.args.get('department')

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