docs: comprehensive README rewrite with features, security, and archi… #172

Job	Run time
ts-check	3m 2s
rust-check	4m 24s
e2e-web	2m 31s
coverage-report	10s
build	14m 5s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	6m 37s
rust-test (macos-latest, aarch64-apple-darwin)	2m 10s
rust-test (windows-latest, x86_64-pc-windows-msvc)	4m 58s
e2e-desktop / e2e-desktop (windows-latest)	22m 2s
e2e-desktop / e2e-desktop (ubuntu-latest)	15m 0s
test-report	8s
e2e-desktop / e2e-report	10s
	1h 15m 17s

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