feat: container liveness sync + node-runner slim base

- Add syncStatus() to InstanceService: detects crashed/stopped containers,
  marks them ERROR with last log line as context
- Reconcile now syncs container status first (detect dead before counting)
- Add 30s periodic sync loop in main.ts
- Switch node-runner from alpine to slim (Debian) for npm compatibility
  (fixes home-assistant-mcp-server binary not found on Alpine)

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

src/mcpd/src/services/instance.service.ts

@@ -36,8 +36,41 @@ export class InstanceService {
     return instance;
   }
 
+  /**
+   * Sync instance statuses with actual container state.
+   * Detects crashed/stopped containers and marks them ERROR.
+   */
+  async syncStatus(): Promise<void> {
+    const instances = await this.instanceRepo.findAll();
+    for (const inst of instances) {
+      if ((inst.status === 'RUNNING' || inst.status === 'STARTING') && inst.containerId) {
+        try {
+          const info = await this.orchestrator.inspectContainer(inst.containerId);
+          if (info.state === 'stopped' || info.state === 'error') {
+            // Container died — get last logs for error context
+            let errorMsg = `Container ${info.state}`;
+            try {
+              const logs = await this.orchestrator.getContainerLogs(inst.containerId, { tail: 5 });
+              const lastLog = (logs.stdout || logs.stderr).trim().split('\n').pop();
+              if (lastLog) errorMsg = lastLog;
+            } catch { /* best-effort */ }
+            await this.instanceRepo.updateStatus(inst.id, 'ERROR', {
+              metadata: { error: errorMsg },
+            });
+          }
+        } catch {
+          // Container gone entirely
+          await this.instanceRepo.updateStatus(inst.id, 'ERROR', {
+            metadata: { error: 'Container not found' },
+          });
+        }
+      }
+    }
+  }
+
   /**
    * Reconcile instances for a server to match desired replica count.
+   * - Syncs container statuses first (detect crashed containers)
    * - If fewer running instances than replicas: start new ones
    * - If more running instances than replicas: remove excess (oldest first)
    */
@@ -45,6 +78,9 @@ export class InstanceService {
     const server = await this.serverRepo.findById(serverId);
     if (!server) throw new NotFoundError(`McpServer '${serverId}' not found`);
 
+    // Sync container statuses before counting active instances
+    await this.syncStatus();
+
     const instances = await this.instanceRepo.findAll(serverId);
     const active = instances.filter((i) => i.status === 'RUNNING' || i.status === 'STARTING');
     const desired = server.replicas;