chore(docker): aspnet runtime image, port 8080 and A2A settings

docker-compose.yml

@@ -12,6 +12,8 @@ services:
     # Chromium crashes with Docker's 64 MB /dev/shm.
     shm_size: 1gb
     stop_grace_period: 30s
+    # The A2A server's port inside the network (Coolify's proxy routes the domain to it); nothing listens with A2A off.
+    expose: ["8080"]
     environment:
       - TELEGRAM_BOT_TOKEN=${TELEGRAM_BOT_TOKEN}
       - TELEGRAM_ALLOWED_USER_IDS=${TELEGRAM_ALLOWED_USER_IDS}
@@ -28,6 +30,8 @@ services:
       - ADMIN_USER_ID=${ADMIN_USER_ID:-}                    # may /impersonate other users (telegram-bot.md)
       - DEFAULT_TIMEZONE=${DEFAULT_TIMEZONE:-}              # chats' default zone (scheduler spec §7); empty → TZ
       - PROCESS_ENV_ALLOW=${PROCESS_ENV_ALLOW:-}            # deny-listed variables the agent may see, e.g. GH_TOKEN
+      - A2A__Enabled=${A2A_ENABLED:-false}                  # A2A server (a2a-server spec); needs a domain in Coolify
+      - A2A__PublicUrl=${A2A_PUBLIC_URL:-}                  # e.g. https://bot.example.com; required for push webhooks
       # Playwright MCP preset (MCP spec): the preinstalled binary, no npx download. Set PLAYWRIGHT_ENABLED=false for an
       # image built with INSTALL_PLAYWRIGHT=false (no nested default: Coolify parses these expressions itself).
       - PLAYWRIGHT_ENABLED=${PLAYWRIGHT_ENABLED:-true}