Make camera startup nonblocking#48
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The main motivation for this is to drastically speed up startup of the app when no camera is connected (during development), taking it from >30 seconds to less than 1 on my laptop.
Moves the legacy Camera 1 webcam path onto the same status-driven pattern as the other camera receivers.
The app still starts the camera path by default, but opening and reconnecting the local camera now happens in a background receiver thread instead of during route import/startup. The video route streams the latest cached JPEG or a placeholder, and /api/camera/status reports connection state for diagnostics.
Validated with env UV_CACHE_DIR=/tmp/uv-cache uv run --frozen --group dev pytest, env UV_CACHE_DIR=/tmp/uv-cache uv run --frozen --group lint ruff check ., and git diff --check.