wasm: in-browser OCR via ONNX Runtime Web interop (#157 stage 1) #521

Job	Run time
msrv (1.85 core · 1.88 workspace)	38s
test (stable)	3m 46s
fmt · clippy (pinned)	21s
wasm32 (declarative converters)	1m 10s
check (cuda,tensorrt, ubuntu-latest)	42s
check (coreml, macos-latest)	1m 15s
check (directml, windows-latest)	1m 47s
check (cuda, ubuntu-latest)	33s
release & publish	-1s
	10m 11s

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