Version parsing not supporting semver pre-release tag for suspend/resume system

[Bafbi]

Scope
https://github.com/InseeFrLab/onyxia-api

Describe the bug
Suspend/Resume on a user service fails with IllegalArgumentException: Invalid release version ... must be a SemVer 2 string when the Helm chart version contains a hyphen (e.g. a SemVer pre-release tag).

To Reproduce

1. Install a service whose chart version contains a hyphen, e.g. 0.1.0-abc1234.
2. Call POST /my-lab/app/suspend or /my-lab/app/resume with the service ID.
3. API returns 500 with Invalid release version abc1234, must be a SemVer 2 string.

Root cause
MyLabController.suspendOrResume() extracts the chart version by splitting the chart field from helm list on lastIndexOf('-'):

String chart = userService.getChart();       // "chartname-1.2.3-prerelease"
int split = chart.lastIndexOf('-');
String chartName = chart.substring(0, split);   // "chartname-1.2.3" ← wrong
String version = chart.substring(split + 1);    // "prerelease" ← wrong

If the version itself contains a hyphen (valid SemVer 2.0 pre-release), the split grabs only the part after the last hyphen, which lacks MAJOR.MINOR.PATCH and fails the strict SemVer regex in HelmInstallService.installChart().

Expected behavior
The full SemVer version (pre-release tag included) should be passed to the Helm upgrade command. A workaround on the client side is to never use hyphens in chart versions, but the API should handle this correctly.

Suggested fix
Replace lastIndexOf('-') with a more robust parsing approach. The chart name is known from the catalog metadata or the Onyxia secret — it shouldn't need to be re-extracted from the helm list chart field. Alternatively, use indexOf('-') and validate against known chart names.

Environment

• onyxia-api v4.11.0
• Charts with versions using SemVer pre-release tags (e.g. MAJOR.MINOR.PATCH-prerelease)

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