docs: add brand logo detection section to all READMEs

Documents keyword-based detection mechanism and lists all 34 supported
brands with their trigger keywords, organised by category.

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

README.md

@@ -270,6 +270,55 @@ All data is stored in `./db_data/`:
 
 ---
 
+## 🏷️ Brand logo detection
+
+Logo detection runs automatically against the device **name** and **description** fields (case-insensitive keyword matching). No manual configuration needed — just include a recognisable keyword in the name or description.
+
+Logos are displayed in two places:
+- **Topology view** — small inline SVGs next to the device name on each chip
+- **Device list** — coloured badge(s) in the device card
+
+Multiple logos can appear simultaneously if several keywords match.
+
+| Category | Brand | Trigger keywords |
+|----------|-------|-----------------|
+| Virtualisation | Proxmox | `proxmox`, `pve` |
+| Virtualisation | Docker | `docker` |
+| NAS | Synology | `synology`, `dsm` |
+| NAS | TrueNAS | `truenas`, `freenas` |
+| Network | Ubiquiti / UniFi | `ubiquiti`, `unifi`, `usg`, `udm` |
+| Network | MikroTik | `mikrotik`, `routeros` |
+| Network | Cisco | `cisco` |
+| Network | TP-Link | `tp-link`, `tplink` |
+| Network | ASUS | `asus` |
+| Network | Netgear | `netgear` |
+| Network | pfSense | `pfsense` |
+| Network | OPNsense | `opnsense` |
+| Network | OpenWrt | `openwrt` |
+| Web / proxy | Apache | `apache`, `apache2`, `httpd` |
+| Web / proxy | Traefik | `traefik` |
+| Database | MariaDB | `mariadb` |
+| Orchestration | Kubernetes | `kubernetes`, `k8s`, `kubectl`, `k3s` |
+| OS | Debian | `debian` |
+| OS | Ubuntu | `ubuntu` |
+| Automation | Ansible | `ansible` |
+| Servers | Dell | `dell`, `idrac`, `poweredge` |
+| Servers | HP | `proliant`, `ilo`, `hewlett` |
+| SBC / DIY | Raspberry Pi | `raspberry`, `rpi`, `raspi` |
+| SBC / DIY | Arduino | `arduino` |
+| Desktop | KDE / Plasma | `kde`, `plasma` |
+| Tools | Excalidraw | `excalidraw` |
+| Self-hosted | Nextcloud | `nextcloud` |
+| Self-hosted | Paperless-NGX | `paperless`, `paperless-ngx` |
+| Self-hosted | Uptime Kuma | `uptime-kuma`, `uptime kuma` |
+| Self-hosted | MkDocs | `mkdocs` |
+| Media / home automation | Jellyfin | `jellyfin` |
+| Media / home automation | Home Assistant | `homeassistant`, `home assistant`, `hassio` |
+| Media / home automation | Philips Hue | `philips hue`, `hue bridge` |
+| Media / home automation | Xiaomi | `xiaomi`, `mi home`, `yeelight` |
+
+---
+
 ## 🧑‍💻 Development
 
 ### Backend tests