fix: warn-and-skip on duplicate repo keys instead of crashing

[marcinpsk]

The upstream DTL repo legitimately contains files with the same model name but different part numbers (e.g. HPE 38L7559.yaml and 834167-001.yaml both have model 'HPE Drive LTO-7 Ultrium 7-SCSI'). Previously the loaders raised ValueError which crashed export-diff.

Change all three loaders (_load_repo_device_types, _load_repo_module_types, _load_repo_rack_types) to log a verbose warning and keep the first-seen entry, matching the import path's behaviour when encountering same-name records.

Summary by CodeRabbit

• Bug Fixes
  • Configuration files with duplicate entries are now handled gracefully with detailed logging instead of causing the application to fail. The first entry is preserved.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Organization UI

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Run ID: 3b1f6787-3d94-45b9-8704-d841b3007097

📥 Commits

Reviewing files that changed from the base of the PR and between 1572c95 and e7ecbf7.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• core/export.py

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Walkthrough

This PR modifies core/export.py to change duplicate key handling across three YAML loaders. Device-type, module-type, and rack-type repo loaders now emit verbose logs reporting duplicate key file locations and retain the first-seen entry instead of raising exceptions.

Changes

Duplicate Key Handling

Layer / File(s)	Summary
Device-type, module-type, and rack-type duplicate key logging core/export.py	Device-type loader (lines 516–520), module-type loader (lines 542–546), and rack-type loader (lines 568–572) replace ValueError exceptions with logging that reports both the earlier and duplicate file paths, then skip the later duplicate while keeping the first-seen YAML entry.

🎯 2 (Simple) | ⏱️ ~8 minutes

🐰 Three loaders once threw and crashed,
Now they log and gently pass,
First one stays, the rest are hashed,
Duplicates become a gentle task. ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and accurately describes the main change: updating duplicate key handling from crashing (ValueError) to warning and skipping duplicates in repo loaders.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/export

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