feat: add Custom Docker Labels support to App Store wizard (Fixes #1518)

[brianewman]

What does this PR do?

This introduces frontend support for defining arbitrary Custom Docker Labels when creating or editing an application via the App Store's "Custom Install" wizard.

This UI submission is the frontend companion to the label parsing logic implemented in CasaOS-AppManagement PR 213.

Changes Made

• Added a Labels array input group to the ComposeConfig.vue template, styled identically to the Environment Variables wizard.
• Updated parseComposeItem() to extract Docker labels from an imported Docker Compose template and bind them to the reactive composeServicesItem.labels state.
• Implemented an explicit exclusion list to hide CasaOS's reserved internal namespace labels (e.g., casaos, icon, host, com.docker.compose.*, etc.) from the user-facing UI, preventing accidental corruption of daemon-managed configuration parameters.
• Updated outputConfigDataCommands() to correctly serialize user-defined labels back out to the API payload during Save/Export actions.

Related Issues

• Resolves #1518

[brianewman]

Closing this temporarily. I realized I targeted main instead of the correct development branch. I will open an issue to discuss the feature and find out the correct target branch before resubmitting. Thanks!

[brianewman]

Upon further review, it appears it may be acceptable to submit this against main. I'm going to reopen it, but feel free to close it if I'm wrong.

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud