Add Cyclic Subscriptions panel

[bburda]

Summary

Add a Cyclic Subscriptions panel for managing multi-collection SSE subscriptions.

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Proposed solution (optional)

• New CyclicSubscriptionsPanel component
• Create subscription via POST /{entity_type}/{entity_id}/cyclic-subscriptions
• List subscriptions via GET /{entity_type}/{entity_id}/cyclic-subscriptions
• View/update/delete individual subscriptions
• SSE event stream view via GET /{entity_type}/{entity_id}/cyclic-subscriptions/{subscription_id}/events
• Support multiple collections: data, faults, logs, configurations, update-status

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Additional context (optional)

Depends on sovd_web_ui#42 (client migration). Gateway supports multi-collection cyclic subscriptions since v0.4.0.