Move the inbound TLS and Reality stream-security blocks out of
InboundFormModal into presentational components under
inbounds/form/security/. The Radio.Group security selector stays in the
modal; TlsForm and RealityForm receive their cert/key/ECH generation
handlers and the saving flag as props. InboundFormModal drops from 2105
to 1708 lines.
Add inbound-form-blocks.test.tsx: render-snapshot coverage for each
extracted transport (raw/ws/grpc/kcp/httpupgrade/xhttp) and security
(tls/reality) component in isolation inside a minimal Form. The full
modal cannot exercise the stream/security tabs in jsdom because they are
gated behind Form.useWatch values that do not propagate in the test
harness, so component-level snapshots are the regression net for these
blocks. No behavior change.
