docs: add Claude Code memory backup instructions to README

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -384,3 +384,29 @@ Each office runs its own `cloudflared` tunnel on its own PC. Ports never conflic
 | Community Dentists of Lowell | `http://192.168.1.236:3000` | `https://communitydentistsoflowell.mydentalofficemanagement.com` | `dental-app` |
 | Summit Dental Care | `http://<its-ip>:3000` | `https://summitdentalcare.mydentalofficemanagement.com` | `summit-dental-app` |
 | Next office | `http://<its-ip>:3000` | `https://<subdomain>.mydentalofficemanagement.com` | `<office>-app` |
+
+---
+
+## Claude Code Memory
+
+Claude Code (the AI assistant used to build this project) stores its memory locally on the PC. This memory contains project context, architecture decisions, feature history, and working preferences — allowing Claude to pick up where it left off in new sessions.
+
+**Memory location:**
+```
+/home/ff/.claude/projects/-home-ff-Desktop-DentalManagementMH06/memory/
+```
+
+**To copy to a new PC:**
+
+1. On the old PC, copy the memory folder:
+```bash
+cp -r /home/ff/.claude/projects/-home-ff-Desktop-DentalManagementMH06/memory/ /media/usb/claude-memory-backup/
+```
+
+2. On the new PC, recreate the directory and paste:
+```bash
+mkdir -p /home/ff/.claude/projects/-home-ff-Desktop-DentalManagementMH06/memory/
+cp -r /media/usb/claude-memory-backup/* /home/ff/.claude/projects/-home-ff-Desktop-DentalManagementMH06/memory/
+```
+
+The memory is plain markdown files and can also be copied manually via a USB drive or file manager. Enable "show hidden files" (Ctrl+H) in the file manager to see the `.claude` folder.