fix: add Overview submodule for v13 module overview compatibility

[CybotTM]

Summary

• Adds an explicit admin_vault_overview submodule as the first child of the admin_vault parent module
• Uses position => ['before' => '*'] to ensure it appears first in the module menu
• In TYPO3 v13, clicking a parent module with dependsOnSubmodules => true auto-redirects to the first submodule — this fix ensures users land on the Overview page instead of the Secrets submodule
• In TYPO3 v14, showSubmoduleOverview => true handles this natively, so the new submodule simply becomes an additional entry

Problem

TYPO3 v14 introduced showSubmoduleOverview which renders a module overview page when clicking the parent module. In v13, this feature doesn't exist — instead, dependsOnSubmodules => true causes an auto-redirect to the first registered submodule. Without an explicit Overview submodule, users were redirected directly to Secrets, never seeing the overview dashboard.

Test plan

• In TYPO3 v13: Click "Vault" in backend sidebar → should show Overview page with statistics and Quick Start guide
• In TYPO3 v14: Click "Vault" in backend sidebar → should still show module overview (via native showSubmoduleOverview)
• In v14: "Overview" tab should appear as first item in module menu
• Verify all other submodules (Secrets, Key Pairs) still work

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a compatibility issue in TYPO3 v13 where clicking a parent module with submodules would automatically redirect to the first registered submodule, bypassing any intended overview page. By introducing an explicit "Overview" submodule and configuring it as the first entry, the change ensures that users consistently land on the overview dashboard in v13, while gracefully integrating as an additional menu item in v14 which handles overviews natively.

Highlights

• New Overview Submodule: Introduced an admin_vault_overview submodule to serve as the initial landing page for the admin_vault parent module.
• Module Menu Positioning: Configured the new overview submodule to appear first in the module menu using position => ['before' => '*'].
• TYPO3 v13 Compatibility: Ensured TYPO3 v13 users are redirected to the Overview page when clicking the parent module, addressing the native redirect behavior that previously sent them to the Secrets submodule.
• Parent Module Update: Updated the admin_vault parent module from 'admin' to 'tools' for improved TYPO3 v13 and v14 compatibility.

Changelog

• Configuration/Backend/Modules.php
  • Changed the parent of the admin_vault module from admin to tools for better version compatibility.
  • Added a new admin_vault_overview submodule definition, setting its position to appear before all other submodules.
• Resources/Private/Language/Modules/overview_submodule.xlf
  • Added a new XLIFF language file to provide labels and descriptions for the admin_vault_overview submodule.

Activity

• CybotTM provided a detailed summary outlining the purpose and impact of the changes.
• CybotTM explained the problem being solved, specifically the TYPO3 v13 module redirection behavior.
• CybotTM included a comprehensive test plan for verifying the fix across TYPO3 v13 and v14.

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[github-actions]

Automated approval for solo maintainer project

This PR has passed all automated quality gates:

• ✅ Static analysis (PHPStan)
• ✅ Code style (PHP-CS-Fixer)
• ✅ Unit & functional tests
• ✅ Security scanning
• ✅ Dependency review

See SECURITY_CONTROLS.md for compensating controls documentation.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[gemini-code-assist]

Code Review

This pull request introduces a compatibility fix for TYPO3 v13 by adding an explicit 'Overview' submodule. This ensures that users are directed to the overview page by default, which is a good solution for the behavior of dependsOnSubmodules in v13. The changes are well-commented and clearly explained. I have one suggestion to conditionally register this new submodule to improve long-term maintainability and avoid redundancy in newer TYPO3 versions.