Add timestamps to cache entries and server events

[madsrasmussen]

Add a timestamp to server events and client cache entries

[Copilot]

Pull Request Overview

This PR adds timestamp tracking to cache entries and server events in the Umbraco management API frontend. The changes implement client-side timestamping to track when events and cache entries are created.

Key Changes

• Added clientTimestamp field to server event models and automatically populated it when events are received
• Added timestamp field to all cache entry models (item cache, detail cache, and in-flight request cache)
• Renamed cache classes for better consistency and clarity

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
types.ts	Added clientTimestamp field to server event model interface
server-event.context.ts	Modified event handler to inject client timestamp when receiving server events
management-api/item/cache.ts	Added timestamp to item cache entries and renamed interface for clarity
management-api/inflight-request/cache.ts	Added timestamp to in-flight request cache and restructured cache entries
management-api/detail/cache.ts	Added timestamp to detail cache entries and renamed interface
detail-data.request-manager.ts	Updated to use renamed in-flight request cache class and handle new cache structure
document-type-detail.server.request-manager.ts	Updated import and instantiation of renamed cache class
data-type-detail.server.request-manager.ts	Updated import and instantiation of renamed cache class