feat: point the fleet at wss LiveKit room uwh-telhai

Publish and subscribe over wss://livekit.uni-wh.de:7800 and refuse
cleartext ws://. Conference room is uwh-telhai. Includes the uncommitted
encoded H.264 publish path, Rally hairpin, and KMS wall overlay.

tests/test_audio_gst.py

@@ -0,0 +1,19 @@
+from audio_gst import grouped_audio, shared_audio_cmd
+
+
+def test_shared_audio_cmd_no_video_elements():
+    cams = [("cam-01", 4), ("cam-02", 5)]
+    cmd = shared_audio_cmd(cams, 16000, [8, 9])
+    joined = " ".join(cmd)
+    assert joined.count("alsasrc") == 2
+    assert "device=hw:4,0" in joined
+    assert "device=hw:5,0" in joined
+    assert "h264enc" not in joined
+    assert "v4l2src" not in joined
+
+
+def test_grouped_audio_splits():
+    cams = [(f"cam-{i:02d}", i + 1) for i in range(1, 21)]
+    fds = list(range(20))
+    groups = grouped_audio(cams, fds, 5)
+    assert len(groups) == 4