docs: update README, CLAUDE.md, backlog, and .env.example

- README: add all features, correct tech stack (axios/setInterval), add IP addresses section, fix API routes
- CLAUDE.md: fix architecture, remove SWR references, fix env var names, add IP address patterns
- backlog: remove ip6= mention, clean duplicate entries, mark done
- .env.example: remove unused PROXMOX_CONSOLE_TOKEN

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.env.example

@@ -3,7 +3,6 @@
 
 PROXMOX_API_URL=http://proxmox.lan:8006/api2/json
 PROXMOX_WEB_URL=http://proxmox.lan:8006
-PROXMOX_CONSOLE_TOKEN=root@pam!monitorapp
 PROXMOX_TOKEN_ID=root@pam!monitorapp
 PROXMOX_TOKEN_SECRET=<your-token-secret>
 API_POLL_INTERVAL=30000