feat(dashboard): add paused badge and pause/resume toggle to agent cards

When ContainerView.paused is true, show a clickable yellow `⏸ paused`
badge on the agent card that POSTs to the new /api/resume/{name} endpoint
to un-park the turn loop. The badge doubles as the resume button so the
state is self-documenting and one click to fix.

The agent action menu gains ⏸ P4US3 (when not paused) and ▶ R3SUM3
(when paused), orthogonal to the running/stopped start/stop actions.

On the backend, /api/pause/{name} and /api/resume/{name} POST routes
wire to Coordinator::set_paused and trigger an immediate rescan so the
badge flips via the existing SSE ContainerUpdate without polling.

Depends on the ContainerView.paused field and Coordinator::set_paused
added in the parent PR.

hive-c0re/src/dashboard/mod.rs

@@ -193,6 +193,8 @@ pub async fn serve(
         .route("/api/restart/{name}", post(lifecycle_ops::post_restart))
         .route("/api/start/{name}", post(lifecycle_ops::post_start))
         .route("/api/rebuild/{name}", post(lifecycle_ops::post_rebuild))
+        .route("/api/pause/{name}", post(lifecycle_ops::post_pause))
+        .route("/api/resume/{name}", post(lifecycle_ops::post_resume))
         .route("/api/update-all", post(lifecycle_ops::post_update_all))
         .route(
             "/api/infra-container/{name}/{action}",