Extract the speed test into its own omarchy.speedtest panel plugin

The network panel now summons it, so a clone or a third-party plugin
declaring clonedFrom: omarchy.speedtest can replace the whole speed
test -- dials and run orchestration alike -- for every caller.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

shell/plugins/panels/speedtest/manifest.json

@@ -0,0 +1,14 @@
+{
+  "schemaVersion": 1,
+  "id": "omarchy.speedtest",
+  "name": "Speed Test",
+  "version": "1.0.0",
+  "author": "Omarchy",
+  "description": "Internet speed test with download and upload dials",
+  "kinds": [
+    "panel"
+  ],
+  "entryPoints": {
+    "panel": "Panel.qml"
+  }
+}