Add Android APK fleet nodes with Crucible UI integration and tests.

APK wrapper registers platform=android via AETHERFORGE_PLATFORM; fleet UI shows robot icons, Android Access Depth probes, and a shortened mining onion timeline.

server/web/src/help/platform.test.ts

@@ -0,0 +1,16 @@
+/** @vitest-environment node */
+import { describe, expect, it } from 'vitest';
+import { isAndroidPlatform, platformIcon, platformLabel } from './platform';
+
+describe('platform helpers', () => {
+  it('labels android fleet nodes', () => {
+    expect(platformLabel('android')).toBe('Android');
+    expect(isAndroidPlatform('android')).toBe(true);
+    expect(platformIcon('android')).toBe('🤖');
+  });
+
+  it('labels darwin as macOS with apple icon', () => {
+    expect(platformLabel('darwin')).toBe('macOS');
+    expect(platformIcon('darwin')).toBe('🍎');
+  });
+});