Add structured log for React Query cache hit on creator profile fetch with cache age

[Chucks1093]

Summary

When a creator profile is served from the React Query cache without a network request, there is no log recording the hit or how old the cached data is. A debug-level log on cache hit would help developers verify that caching is working as intended in production.

Scope

• Add a query observer on the creator profile query that fires when data is returned from cache (isFetching: false and isStale: false immediately on mount)
• Emit a debug-level log with fields: creator_id, cache_status: 'hit', data_age_ms (time since the query was last fetched)
• Log must not fire when the query performs a network fetch
• Log not emitted in the test environment

Acceptance Criteria

• Log emitted on cache hit with all three fields
• data_age_ms reflects time since last successful fetch
• Log not emitted when a network fetch occurs
• Log not emitted in test environment

ETA: 12 hours

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[Malcolm-Wander]

@Malcolm-Wander has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello maintainer,I’d love to work on this issue please,I promise to do a good and swift job..thank you very much

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[mikevill20]

@mikevill20 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello maintainer, please assign this issue to me. Thanks

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[Kvnghayjay]

@Kvnghayjay has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi.... I’ve reviewed the expected behavior and I’m confident I can implement the necessary changes accurately and efficiently.

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[k-deejah]

@k-deejah has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi Maintainer, I can work on this issue

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