Add System Info page to Status dashboard with deployment metadata

[oveldman]

Summary

Adds a System Info page to the Status dashboard that displays the currently deployed image tag as a clickable link to the corresponding GitHub release. Deployment metadata (System:Tag, System:Git:Repository) is injected via a new SystemSettings configuration class, overridden in Helm using appVersion so the tag always matches the running image.

Changes

• Added SystemSettings / GitSettings config classes bound to the System section in appsettings.json
• Added System section to appsettings.json and appsettings-schema.json
• Registered Configure<SystemSettings> in Program.cs
• Created Components/Pages/System.razor at /system — shows image tag as a link to {Repository}/releases/tag/{Tag}
• Added "System" nav link to the Status sidebar in MainLayout.razor
• Overrode System__Tag in status.yaml Helm template using {{ .Values.appVersion }}

How to Test

• Deploy the Helm chart and navigate to https://status.<domain>/system
• Verify the tag matches the deployed appVersion and the link resolves to the correct GitHub release page
• Locally: set System:Tag and System:Git:Repository in appsettings.json, run the Status project, and visit /system

Checklist

• Code builds without errors
• Changes have been tested locally
• No new warnings introduced

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud