refactor: unify feature install UI with global store, add healthcheck and GPU profile to compose

Replace FeatureInstallPrompt's local SSE/polling with useFeaturesStore
so install progress, errors, and recovery are handled globally — works
across navigation, logout/login, and partial downloads. Shows fun
progress messages and ETA matching the settings page.

Add compose healthcheck and optional GPU profile (--profile gpu).

docker/docker-compose.yml

@@ -3,7 +3,7 @@ services:
     build:
       context: ..
       dockerfile: docker/Dockerfile
-    image: ashimhq/ashim:latest
+    image: ashim:latest
     container_name: ashim
     ports:
       - "1349:1349"
@@ -15,12 +15,32 @@ services:
       - DEFAULT_USERNAME=admin
       - DEFAULT_PASSWORD=admin
     restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:1349/api/v1/health"]
+      interval: 30s
+      timeout: 5s
+      start_period: 60s
+      retries: 3
     logging:
       driver: json-file
       options:
         max-size: "10m"
         max-file: "3"
 
+  ashim-gpu:
+    extends:
+      service: ashim
+    container_name: ashim-gpu
+    profiles:
+      - gpu
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              count: all
+              capabilities: [gpu]
+
 volumes:
   ashim-data:
   ashim-workspace: