docs: comprehensive README rewrite with features, security, and archi… #169

Job	Run time
ts-check	2m 40s
rust-check	4m 24s
coverage-report	7s
e2e-web	2m 14s
build	5m 3s
rust-test (macos-latest, aarch64-apple-darwin)	3m 49s
rust-test (windows-latest, x86_64-pc-windows-msvc)	4m 41s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	5m 16s
e2e-desktop / e2e-desktop (ubuntu-latest)	5m 1s
e2e-desktop / e2e-desktop (windows-latest)	4m 51s
e2e-desktop / e2e-report	4s
test-report	7s
	38m 17s

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