Add structured log for wallet activity feed query with result count and wallet address

[Chucks1093]

Summary

Activity feed queries can be slow for wallets with large trade histories. A structured log emitted after each query with the wallet address, result count, and query duration makes slow queries observable without enabling full query logging.

Scope

• Emit a structured debug log after every GET /wallets/:address/activity query resolves
• Fields: wallet_address, result_count, query_duration_ms, filters_applied
• filters_applied lists any active type or creator_id filter params
• Wallet address should be masked to first 4 and last 4 characters in the log

Acceptance Criteria

• Log emitted after every activity feed query
• All four fields present with correct values
• Wallet address is masked in log output

ETA: 12 hours

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Coordinate on Telegram

[iwayemi5]

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[anoncon]

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@anoncon's PR #479 was approved and merged by @Chucks1093.

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