add: RomM 4.5 ROM manager on docker-pm3

- Deployed RomM via Docker on VM 109 (docker-pm3)
- URL: http://10.4.2.202:8998
- ROM library mounted from KavNas:/volume1/Media/Roms
- MariaDB backend for metadata
- Added persistent NFS mount on docker-pm3

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/CONFIGURATIONS.md

@@ -379,3 +379,47 @@ http:
           - url: "http://10.4.2.24:2283"
 ```
 
+## RomM
+
+**Location**: Docker on docker-pm3 (VM 109)
+**IP**: 10.4.2.202:8998
+**Version**: 4.5.0
+
+**Docker Compose** (`/opt/romm/docker-compose.yml`):
+```yaml
+services:
+  romm:
+    image: rommapp/romm:latest
+    container_name: romm
+    ports:
+      - 8998:8080
+    environment:
+      - DB_HOST=romm-db
+      - DB_NAME=romm
+      - DB_USER=romm-user
+      - DB_PASSWD=55e7720ac5100322678bacf0a7705bf9
+      - ROMM_AUTH_SECRET_KEY=05817a5501383c44287fc4079082f9fc0543013f186e61789aa2cc2be58d22e8
+    volumes:
+      - /mnt/kavnas/Roms/roms:/romm/library
+      - /mnt/kavnas/Roms/assets:/romm/assets
+      - /opt/romm/config:/romm/config
+
+  romm-db:
+    image: mariadb:latest
+    container_name: romm-db
+    environment:
+      - MARIADB_ROOT_PASSWORD=55e7720ac5100322678bacf0a7705bf9
+      - MARIADB_DATABASE=romm
+      - MARIADB_USER=romm-user
+      - MARIADB_PASSWORD=55e7720ac5100322678bacf0a7705bf9
+```
+
+**NFS Mount** (docker-pm3 `/etc/fstab`):
+```
+10.4.2.13:/volume1/Media /mnt/kavnas nfs rw,soft,nfsvers=4 0 0
+```
+
+**ROM Library Structure**:
+- Library: `/mnt/kavnas/Roms/roms` (organized by platform)
+- Assets: `/mnt/kavnas/Roms/assets` (cover art, screenshots)
+