wasm: in-browser OCR via ONNX Runtime Web interop (#157 stage 1) #512

Job	Run time
test (stable)	2m 22s
wasm32 (declarative converters)	56s
fmt · clippy (pinned)	32s
check (directml, windows-latest)	1m 48s
msrv (1.85 core · 1.88 workspace)	38s
check (cuda,tensorrt, ubuntu-latest)	59s
check (coreml, macos-latest)	1m 12s
check (cuda, ubuntu-latest)	46s
release & publish	0s
	9m 13s

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