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.

generate_udev_rules.py

@@ -13,6 +13,8 @@ import re
 import subprocess
 import sys
 
+from usb_ids import is_fleet_video, is_rally_pid, usb_vid_pid_from_sysfs
+
 HEADER = """\
 # Stable slots for 20x Logitech HD Pro Webcam C920 (046d:08e5).
 # Slot = physical camera, identified by USB serial. Survives reboots,
@@ -67,6 +69,11 @@ def current_state():
         if idx_attr != "0":
             continue
         real = sh(["readlink", "-f", str(node / "device")]).strip()
+        ids = usb_vid_pid_from_sysfs(real)
+        if ids is not None and not is_fleet_video(ids[0], ids[1]):
+            continue
+        if ids is not None and is_rally_pid(ids[1]):
+            continue
         s = _serial_of(real)
         primary_by_serial[s] = f"/dev/{node.name}"
     return primary_by_serial, cards