Add Opus codec, show management info after Asterisk startup

- Install Digium precompiled codec_opus.so in Docker image since Ubuntu
  24.04's asterisk-modules package doesn't include it (bug #2044135).
  Opus is the best codec for mobile VoIP (adaptive bitrate, packet loss
  resilience).
- Rework entrypoint to print the management info banner AFTER Asterisk
  finishes loading, so the CLI command isn't buried in startup log noise.
  The management command is now highlighted in yellow.
- Remove explicit load directive for codec_opus.so from modules.conf;
  autoload=yes handles it when the .so exists, and silently skips when
  it doesn't (no more error log noise on systems without Opus).

https://claude.ai/code/session_01Vm6NLaQuzM4VosAotqS1q8

Dockerfile

@@ -24,6 +24,7 @@ RUN echo "exit 101" > /usr/sbin/policy-rc.d && chmod +x /usr/sbin/policy-rc.d &&
         asterisk-modules \
         openssl \
         curl \
+        wget \
         tcpdump \
         sngrep \
         python3 \
@@ -38,6 +39,20 @@ RUN echo "exit 101" > /usr/sbin/policy-rc.d && chmod +x /usr/sbin/policy-rc.d &&
     && ldconfig \
     && update-ca-certificates 2>/dev/null || true
 
+# Install Opus codec (not included in Ubuntu 24.04 asterisk-modules, bug #2044135)
+# Download Digium's precompiled codec_opus for Asterisk 20 (Ubuntu 24.04 ships Asterisk 20)
+RUN MODULES_DIR=$(find /usr/lib -type d -name modules -path "*/asterisk/*" | head -1) && \
+    if [ -z "$MODULES_DIR" ]; then MODULES_DIR="/usr/lib/x86_64-linux-gnu/asterisk/modules"; fi && \
+    mkdir -p "$MODULES_DIR" /var/lib/asterisk/documentation/thirdparty && \
+    cd /tmp && \
+    wget -q "http://downloads.digium.com/pub/telephony/codec_opus/asterisk-20.0/x86-64/codec_opus-20.0_1.3.0-x86_64.tar.gz" -O codec_opus.tar.gz && \
+    tar -xzf codec_opus.tar.gz && \
+    find /tmp -name "codec_opus.so" -exec cp {} "$MODULES_DIR/" \; && \
+    find /tmp -name "format_ogg_opus.so" -exec cp {} "$MODULES_DIR/" \; && \
+    find /tmp -name "codec_opus_config-en_US.xml" -exec cp {} /var/lib/asterisk/documentation/thirdparty/ \; && \
+    rm -rf /tmp/codec_opus* && \
+    echo "Opus codec installed to $MODULES_DIR"
+
 # Create required directories
 RUN mkdir -p \
     /etc/easy-asterisk \