feat: AI Type Agent - vision-based Open Dental automation via Windows agent

Adds a Windows-side agent (screenshot/click/type over HTTP) plus backend
services to locate UI elements via vision and drive an existing-patient
appointment flow in Open Dental, wired into the Copy/Type Agent page and
socket progress updates.

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

apps/WindowsAgent/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "windowsagent",
+  "private": true
+}