perf: skip stream socket fan-out work when no consumers connected

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The stream socket is intended to be served unconditionally for every
monitor, so the idle path must cost nothing:

- SendMedia returns after counting the sequence when no clients are
  connected: no packet reference, no message allocation, no wake.
  Keyframes are still cached (one refcounted clone per GOP) so the
  first consumer to connect renders immediately.
- The poll loop blocks indefinitely instead of waking 10x/s when no
  clients are connected; it wakes on connection or shutdown.

Tests: existing [stream_socket] suite covers both paths (the late-joiner
test exercises keyframe caching with zero clients). Full suite: 98/98
pass via ctest.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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