Add Pegasus Frontend metadata export support

[gantoine]

Description
^{Explain the changes or enhancements you are proposing with this pull request.}

Add metadata.pegasus.txt export alongside the existing gamelist.xml export. Restructure the export system: rename the gamelist endpoint to a general-purpose export endpoint (/api/export/) with sub-routes for each format (/gamelist-xml, /pegasus). Move config from flat scan.export_gamelist to nested scan.export.gamelist_xml and scan.export.pegasus for auto-export on scan.

Fixes #675

Checklist
^{Please check all that apply.}

• I've tested the changes locally
• I've updated relevant comments
• I've assigned reviewers for this PR
• I've added unit tests that cover the changes

[github-actions]

Test Results (postgresql)

1 025 tests   1 024 ✅  2m 50s ⏱️
    1 suites      1 💤
    1 files        0 ❌

Results for commit 6c88333.

♻️ This comment has been updated with latest results.

[github-actions]

Test Results (mariadb)

1 025 tests   1 024 ✅  2m 38s ⏱️
    1 suites      1 💤
    1 files        0 ❌

Results for commit 6c88333.

♻️ This comment has been updated with latest results.

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
14460	9816	68%	0%	🟢

New Files

File	Coverage	Status
backend/utils/pegasus_exporter.py	69%	🟢
TOTAL	69%	🟢

Modified Files

File	Coverage	Status
backend/config/config_manager.py	55%	🟢
backend/endpoints/sockets/scan.py	24%	🟢
backend/handler/filesystem/base_handler.py	89%	🟢
backend/main.py	95%	🟢
backend/utils/gamelist_exporter.py	63%	🟢
TOTAL	65%	🟢

updated for commit: 6c88333 by action🐍

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Pull request overview

Adds Pegasus Frontend metadata export support and generalizes the existing gamelist export into a multi-format export system.

Changes:

• Introduces metadata.pegasus.txt export generation (Pegasus Frontend format) alongside the existing gamelist.xml export.
• Renames/reshapes the backend API from a dedicated gamelist export route to a general /api/export/* endpoint with per-format subroutes.
• Updates scan auto-export configuration from scan.export_gamelist to scan.export.{gamelist_xml,pegasus} and wires auto-export into the scan completion flow.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
frontend/src/services/api/gamelist.ts	Removes the old dedicated gamelist export client.
frontend/src/services/api/export.ts	Adds new client methods for /export/gamelist-xml and /export/pegasus.
examples/config.example.yml	Documents new scan.export.* auto-export configuration keys.
backend/utils/pegasus_exporter.py	Implements Pegasus metadata.pegasus.txt generation and file writing per platform.
backend/main.py	Registers the new export router under /api.
backend/endpoints/sockets/scan.py	Runs optional auto-export for gamelist XML and Pegasus metadata after scans.
backend/endpoints/export.py	Converts export routing to /export/* and adds Pegasus export endpoint.
backend/config/config_manager.py	Adds new config flags and persists them under scan.export.*; excludes metadata.pegasus.txt from scans.

Comments suppressed due to low confidence (1)

backend/endpoints/export.py:105

• files_written is populated with names like metadata_pegasus_{platform_id}.txt, but the exporter writes a fixed metadata.pegasus.txt into each platform directory. This makes the logs misleading; consider logging the actual filename (and optionally the platform directory) instead of a synthetic name.

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Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 5 comments.

Comments suppressed due to low confidence (1)

backend/endpoints/export.py:105

• The endpoint logs/appends metadata_pegasus_{platform_id}.txt, but the exporter writes metadata.pegasus.txt into each platform directory. This is misleading for users and makes troubleshooting harder; update the recorded filename/log output to match the actual output file name/path.

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Pull request overview

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (2)

backend/endpoints/export.py:50

• The endpoint records/logs filenames like gamelist_{platform_id}.xml, but the exporter writes a fixed gamelist.xml into each platform directory. This makes logs misleading and makes it hard to verify what was actually written; consider logging the real output path (platform dir + filename) or just platform IDs.
  backend/endpoints/export.py:105
• Same issue as the gamelist export: the endpoint logs metadata_pegasus_{platform_id}.txt, but the exporter writes metadata.pegasus.txt into each platform directory. Update the tracked/logged filename to match the actual output (or include the platform directory) to avoid confusion during troubleshooting.

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