chore(release): v0.2.0

Bump root, backend, and frontend to 0.2.0 and move the changelog Unreleased
notes under a dated 0.2.0 heading. Adds Patients pagination, per-patient record
history, patient summary PDF export, the messages bubble/attachment UI, the AI
import approval-card fix, and the Docker network-address fix.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "frontend",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "private": true,
   "scripts": {
     "dev": "next dev",