feat(ui): add action buttons to Docker, Git, systemd, and Caddy modules

- Docker table: Restart and Stop buttons per container row (docker_compose_restart / docker_compose_stop)
- Git repos list: Fetch and Pull buttons per repo; Pull disabled when working tree is dirty
- systemd units list: Restart button per unit (systemctl_restart)
- Caddy: Edit link on /caddy page, new /caddy/edit page with textarea + 3-step Validate → Save+Reload flow
- All buttons open ConfirmDialog with exact agent-call preview, then stream output via StreamingTerminal
- Add docker_compose_stop to ops-agent/commands.yml.example

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ops-agent/commands.yml.example

@@ -85,6 +85,18 @@ commands:
         - postgres
     description: "Restart a docker compose service (ops-agent user must be in the docker group)"
 
+  docker_compose_stop:
+    cmd: ["docker", "compose", "stop"]
+    cwd: "/srv/scrum4me/compose"
+    args:
+      allowed:
+        - scrum4me-web
+        - worker-idea
+        - ops-dashboard
+        - caddy
+        - postgres
+    description: "Stop a docker compose service"
+
   docker_compose_build:
     cmd: ["docker", "compose", "build"]
     cwd: "/srv/scrum4me/compose"