v0.2.0 - Always-on services panel with per-service host config

Dashboard:
- New 'Always-on services' section with cards for Parakeet and Magpie
- Each card: host:port, model loaded, status pill (Healthy/Unhealthy/Starting/Not configured)
- Start, Restart, Stop buttons. Buttons disabled when not applicable for current state
- Restart counter shown when > 1 (would have surfaced the old magpie crash loop)

Backend:
- New /api/services GET: docker container state + http health for each support service
- New POST /api/services/{name}/{action} for start | stop | restart
- services.py module: docker_state, run_action via SSH
- config.py: PARAKEET_HOST/USER/CONTAINER and MAGPIE_* env vars, default to spark2_*
- health.py: use per-service hosts (no longer hard-wired to spark2_host)

Package:
- sparkConfig.yaml.ts: add 6 new optional fields
- configureSparks action: optional 'Parakeet host', 'Parakeet container', 'Magpie host', 'Magpie container' fields; descriptions explain they default to Spark 2 when blank
- Handler normalizes nulls to empty strings before merge
- main.ts: pass new env vars to container
- bump to 0.2.0:0

package/startos/actions/configureSparks.ts

@@ -40,6 +40,42 @@ const inputSpec = InputSpec.of({
     placeholder: 'your SSH username',
     masked: false,
   }),
+  parakeet_host: Value.text({
+    name: 'Parakeet host (optional)',
+    description:
+      'Override the host running the Parakeet STT container. Leave blank if Parakeet runs on Spark 2 — that\'s the default. Set this if you run Parakeet on Spark 1 or a different machine.',
+    required: false,
+    default: null,
+    placeholder: 'leave blank to use Spark 2',
+    masked: false,
+  }),
+  parakeet_container: Value.text({
+    name: 'Parakeet container name (optional)',
+    description:
+      'Docker container name for Parakeet. Defaults to "parakeet-asr" — change only if you named yours something else.',
+    required: false,
+    default: null,
+    placeholder: 'parakeet-asr',
+    masked: false,
+  }),
+  magpie_host: Value.text({
+    name: 'Magpie host (optional)',
+    description:
+      'Override the host running the Magpie TTS container. Leave blank if Magpie runs on Spark 2.',
+    required: false,
+    default: null,
+    placeholder: 'leave blank to use Spark 2',
+    masked: false,
+  }),
+  magpie_container: Value.text({
+    name: 'Magpie container name (optional)',
+    description:
+      'Docker container name for Magpie. Defaults to "magpie-tts".',
+    required: false,
+    default: null,
+    placeholder: 'magpie-tts',
+    masked: false,
+  }),
 })
 
 export const configureSparks = sdk.Action.withInput(
@@ -58,7 +94,11 @@ export const configureSparks = sdk.Action.withInput(
     return cfg ?? null
   },
   async ({ effects, input }) => {
-    await sparkConfigYaml.merge(effects, input)
+    // Optional fields come through as `null`; coerce to empty string for the schema.
+    const normalized = Object.fromEntries(
+      Object.entries(input).map(([k, v]) => [k, v ?? '']),
+    ) as Record<string, string>
+    await sparkConfigYaml.merge(effects, normalized)
     return null
   },
 )