Improve API response for non-existent wallet #1097
When querying a non-existent wallet via GET https://node3.gonka.ai/v1/participants/{address} the API currently returns a 500 Internal Server Error.
Expected Behavior
If the wallet is not found, the API should return 404 Not Found instead of 500
Rationale A missing wallet is a valid client-side case, not a server error. Returning 404 improves API correctness and makes error handling more predictable for clients.
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https://github.com/gonka-ai/gonka/pull/750