Optimize static resource caching with custom configuration

[lcomplete]

Summary

• Implemented custom WebResourceCacheConfig for better control over static resource caching
• Changed ReactAppController to use forward instead of direct path return
• Removed default Spring caching configuration from application.yml

Test plan

• Static resources are properly cached
• React routing works correctly with forwarding
• Cache headers are properly set

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🤖 Augment PR Summary

Summary: This PR refines how the Spring Boot backend serves and caches the embedded React UI’s static resources.

Changes:

• Adds WebResourceCacheConfig with explicit Cache-Control policies for /index.html, JS/CSS bundles, media assets, and common root-level icons.
• Updates ReactAppController to forward:/index.html so SPA routes resolve via the static resource pipeline.
• Removes the previous global spring.web.resources.cache.cachecontrol.max-age setting from application.yml in favor of the custom handler rules.
• Adjusts mobile layout/navigation CSS to use viewport-height containers, safe-area-aware bottom padding, and an explicit scroll container.

Technical Notes: Caching is now pattern-specific (rather than a single global max-age), enabling different cache behavior for the app shell vs. versioned assets.

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