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/Backend/package.json

@@ -33,6 +33,7 @@
     "passport": "^0.7.0",
     "passport-local": "^1.0.0",
     "pdfkit": "^0.17.2",
+    "sharp": "^0.35.3",
     "socket.io": "^4.8.1",
     "twilio": "^6.0.0",
     "ws": "^8.18.0",