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

docker/entrypoint.sh

@@ -308,7 +308,6 @@ load => chan_pjsip.so
 load => codec_ulaw.so
 load => codec_alaw.so
 load => codec_g722.so
-load => codec_opus.so
 load => res_rtp_asterisk.so
 load => app_dial.so
 load => app_page.so
@@ -339,6 +338,20 @@ trap cleanup SIGTERM SIGINT
 
 # ── 12. Start Asterisk ───────────────────────────────────────
 log_info "Starting Asterisk PBX..."
+echo ""
+
+# Start Asterisk in the background, then print management info once ready
+asterisk -f -U asterisk -G asterisk &
+ASTERISK_PID=$!
+
+# Wait for Asterisk to be ready (up to 60 seconds)
+for i in $(seq 1 60); do
+    if asterisk -rx "core show version" >/dev/null 2>&1; then
+        break
+    fi
+    sleep 1
+done
+
 echo ""
 echo -e "${CYAN}══════════════════════════════════════════════════════════════${NC}"
 echo -e "${CYAN}  Easy Asterisk (Docker)${NC}"
@@ -352,9 +365,10 @@ echo -e "${CYAN}─────────────────────
 echo -e "  SIP clients connect to: ${GREEN}${DOMAIN_NAME:-$local_ip}:5061${NC} (TLS)"
 echo -e "  Web Admin:    ${GREEN}http://${local_ip}:${WEB_ADMIN_PORT:-8080}/clients${NC}"
 echo -e "${CYAN}──────────────────────────────────────────────────────────────${NC}"
-echo -e "  Management:   docker exec -it easy-asterisk easy-asterisk"
+echo -e "  Management:   ${YELLOW}docker exec -it easy-asterisk easy-asterisk${NC}"
 echo -e "  Diagnostics:  docker exec -it easy-asterisk vpn-diagnostics"
 echo -e "${CYAN}══════════════════════════════════════════════════════════════${NC}"
 echo ""
 
-exec asterisk -f -U asterisk -G asterisk
+# Wait for Asterisk process (keeps container running)
+wait $ASTERISK_PID