⚡ Bolt: Optimize Qobuz secret verification by short-circuiting network requests

[davidjuarezdev]

💡 What: Refactored _get_valid_secret in streamrip/client/qobuz.py to use asyncio.as_completed instead of asyncio.gather.

🎯 Why: Previously, asyncio.gather would wait for all test requests (even failures and timeouts) to resolve before returning a valid secret. Using asyncio.as_completed allows us to immediately return the first successful secret and cancel any remaining pending test requests. This eliminates unnecessary network I/O and entirely removes slow-tail latency in the secret verification step.

📊 Impact: This significantly speeds up the Qobuz login flow, especially when checking fallback secrets, by short-circuiting as soon as a valid response is received.

🔬 Measurement: Verify by running poetry run pytest tests/test_qobuz_client.py or by attempting a normal login flow and observing faster metadata request initialization times.

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PR created automatically by Jules for task 14961656784116984754 started by @davidjuarezdev