Remove deprecated files and scripts to streamline the codebase

- Deleted unused API test files, RTSP diagnostic scripts, and development utility scripts to reduce clutter.
- Removed outdated database schema and modularization proposal documents to maintain focus on current architecture.
- Cleaned up configuration files and logging scripts that are no longer in use, enhancing project maintainability.

vision-system-remote/src/widgets/SystemHealthWidget.tsx

@@ -0,0 +1,26 @@
+import React from 'react'
+import { StatusWidget } from './StatusWidget'
+import { formatUptime } from '../services/api'
+import type { SystemStatus } from '../services/api'
+
+interface SystemHealthWidgetProps {
+  systemStatus: SystemStatus | null
+}
+
+export const SystemHealthWidget: React.FC<SystemHealthWidgetProps> = ({ systemStatus }) => {
+  const isOnline = systemStatus?.system_started ?? false
+  const uptime = systemStatus?.uptime_seconds ?? 0
+
+  return (
+    <StatusWidget
+      title="System Status"
+      status={isOnline}
+      statusText={isOnline ? 'Online' : 'Offline'}
+      subtitle={uptime > 0 ? `Uptime: ${formatUptime(uptime)}` : undefined}
+      icon={
+        <div className={`w-3 h-3 rounded-full ${isOnline ? 'bg-green-500' : 'bg-red-500'}`} />
+      }
+    />
+  )
+}
+