Add structured log for React Query cache miss on creator profile fetch

[Chucks1093]

Summary

When a creator profile fetch results in a cache miss and triggers a network request, there is no log to help diagnose slow profile loads in production. A structured log on cache miss should record the creator ID and request duration for observability.

Scope

• Add a query observer on the creator profile query that logs on cache miss
• Log fields: creator_id, cache_status: 'miss', duration_ms (time from request start to data arrival)
• Log should only fire in non-test environments
• Log level: debug

Acceptance Criteria

• Log emitted on cache miss with all three fields
• Log not emitted on cache hit
• Log not emitted in test environment
• Log level is debug

ETA: 12 hours

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