Add Logs tab

[bburda]

Summary

Add a Logs tab to the entity resource panel showing log entries per entity with severity filtering and auto-refresh.

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Proposed solution (optional)

• New LogsTab component displaying log entries from GET /{entity_type}/{entity_id}/logs
• Severity filtering (DEBUG, INFO, WARN, ERROR, FATAL)
• Auto-refresh with configurable interval
• Log configuration management via GET/PUT /{entity_type}/{entity_id}/logs/configuration

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Additional context (optional)

Depends on sovd_web_ui#42 (client migration). Gateway exposes /logs endpoints since v0.4.0 with LogProvider plugin interface for custom log backends. Default implementation reads from /rosout, but the endpoint is backend-agnostic.