⚡ Bolt: Replace blocking time.sleep with asyncio.sleep in get_frame_image

[benpiper]

💡 What: Replaced the synchronous time.sleep(1) call with await asyncio.sleep(1) inside the get_frame_image endpoint in backend/main.py. Added code comments explaining the optimization.

🎯 Why: In a FastAPI application, using a blocking I/O call like time.sleep() inside an async def route handler completely blocks the main asyncio event loop. This prevents the server from processing any other concurrent requests while sleeping (which can be up to 30 seconds for missing frames).

📊 Impact: Resolves a critical concurrency bottleneck. The server can now handle multiple incoming requests smoothly instead of completely freezing while polling for frame creation.

🔬 Measurement: Check server responsiveness when requesting missing frames (e.g. testing concurrent API hits).

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PR created automatically by Jules for task 13287616315286611189 started by @benpiper

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