Initial commit — DRB client (edge node) stack

Includes edge-node (FastAPI/MQTT/Discord voice), op25-container (SDR decoder),
and icecast (audio streaming).

icecast/icecast.xml.template

@@ -0,0 +1,49 @@
+<icecast>
+  <location>server</location>
+  <admin>admin@localhost</admin>
+
+  <limits>
+    <clients>100</clients>
+    <sources>10</sources>
+    <threadpool>5</threadpool>
+    <queue-size>524288</queue-size>
+    <client-timeout>30</client-timeout>
+    <header-timeout>15</header-timeout>
+    <source-timeout>10</source-timeout>
+    <burst-on-connect>1</burst-on-connect>
+    <burst-size>65535</burst-size>
+  </limits>
+
+  <authentication>
+    <source-password>${ICECAST_SOURCE_PASSWORD}</source-password>
+    <relay-password>${ICECAST_SOURCE_PASSWORD}</relay-password>
+    <admin-user>admin</admin-user>
+    <admin-password>${ICECAST_ADMIN_PASSWORD}</admin-password>
+  </authentication>
+
+  <hostname>localhost</hostname>
+  <listen-socket>
+    <port>8000</port>
+  </listen-socket>
+
+  <http-headers>
+    <header name="Access-Control-Allow-Origin" value="*"/>
+  </http-headers>
+
+  <paths>
+    <basedir>/usr/share/icecast2</basedir>
+    <logdir>/tmp</logdir>
+    <webroot>/usr/share/icecast2/web</webroot>
+    <adminroot>/usr/share/icecast2/admin</adminroot>
+  </paths>
+
+  <logging>
+    <accesslog>icecast-access.log</accesslog>
+    <errorlog>icecast-error.log</errorlog>
+    <loglevel>3</loglevel>
+  </logging>
+
+  <security>
+    <chroot>0</chroot>
+  </security>
+</icecast>