[PLUGINS] Add plugin health dashboard with runnable, degraded, and blocked states

[utksh1]

Problem

SecuScan needs a production-grade improvement in this area: Operational plugin visibility..

Scope

Build a UI view that summarizes plugin availability, dependency failures, signature status, and last execution health.

Acceptance Criteria

• The implementation is focused and does not introduce unrelated UI, docs, lockfile, or formatting churn.
• Security-sensitive behavior has explicit negative tests where applicable.
• Existing tests continue to pass, and new tests cover the main success and failure paths.
• Documentation or configuration examples are updated when operator behavior changes.

Verification

Frontend tests should cover grouped states, empty state, error state, and navigation to plugin details.

Difficulty

Hard, useful issue intended for experienced contributors.

[khat190]

Hi @utksh1! I'm a GSSoC contributor. Please assign this to me. Thanks

[Rakshak05]

Hi @utksh1, I would like to work on this issue, as the currently assigned contributor appears to be inactive. Could you please assign it to me as a GSSoC'26 contributor?