UFAL/Add cache config to public config

[jr-rk]

Phases	MP	MM	MB	MR	JM	Total
ETA	0	0	0	0	0	0
Developing	0	0	0	0	0	0
Review	0	0	0	0	0	0
Total	-	-	-	-	-	0
ETA est.						0
ETA cust.	-	-	-	-	-	0

Problem description

Based on #1059
...Frontend requires cache.msToLive and cache.control settings to function
properly. Excludes server-side cache settings (serverSide, autoSync) while
including client-necessary cache configuration.

[Copilot]

Pull Request Overview

This PR adds cache configuration properties (msToLive and control) to the public frontend configuration that gets written to config.json. The change enables the frontend to access cache time-to-live settings that are already widely used throughout the application for object caching.

Key changes:

• Added cache.msToLive and cache.control to the public config object in buildAppConfig function
• Added inline comment explaining that frontend needs these settings

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