feat(agent): collect and display stopped/exited containers

[svenvg93]

📃 Description

Collects and displays stopped, exited, and paused Docker containers in addition to running ones. Stopped containers appear in the containers table with their Docker status string (e.g. Exited (0) 2 hours ago) and zero CPU/memory/network stats. A colored status dot is shown next to the container name to indicate state at a glance.

closes #1786

🪵 Changelog

➕ Added

• Collect stopped/exited/paused containers from the Docker API by default
• Status indicator dot next to container name (green = running, yellow = restarting, muted = paused/created, red = exited/dead)
• DOCKER_RUNNING_ONLY environment variable to opt out and collect only running containers (previous behavior)

✏️ Changed

• Docker container list query now uses ?all=1 by default

📷 Screenshots