Add Unraid deployment guide

UNRAID.md

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+# Unraid Deployment
+
+This project currently ships as a single container:
+
+- the React client is built into `client/dist`
+- the Express server serves both static assets and API routes
+- the container listens on port `3000`
+
+## Prerequisites
+
+- Unraid server with Docker enabled
+- Git access to the repository
+- Internet access for `npm ci` during image build
+
+## Option 1: Build On Unraid From Source
+
+Clone the repo somewhere persistent on the Unraid host:
+
+```bash
+cd /mnt/user/appdata
+git clone https://git.alwisp.com/jason/stellar.git
+cd stellar
+```
+
+Build the image from the repo root:
+
+```bash
+docker build -f docker/Dockerfile -t stellar:local .
+```
+
+Start the container:
+
+```bash
+docker run -d \
+  --name stellar \
+  --restart unless-stopped \
+  -p 8080:3000 \
+  -e PORT=3000 \
+  -e LOG_LEVEL=info \
+  stellar:local
+```
+
+Open the game at:
+
+```text
+http://<your-unraid-ip>:8080
+```
+
+## Option 2: Build With Compose On Unraid
+
+From the repo root:
+
+```bash
+docker compose -f docker/docker-compose.yml build
+docker compose -f docker/docker-compose.yml up -d
+```
+
+This uses the repo’s single-service compose file and exposes the app on port `8080`.
+
+## Option 3: Pull A Prebuilt Image
+
+If you publish an image to your registry, run:
+
+```bash
+docker pull <your-registry>/stellar:<tag>
+docker run -d \
+  --name stellar \
+  --restart unless-stopped \
+  -p 8080:3000 \
+  -e PORT=3000 \
+  -e LOG_LEVEL=info \
+  <your-registry>/stellar:<tag>
+```
+
+## Health Check
+
+The server exposes:
+
+```text
+/healthz
+```
+
+Example:
+
+```bash
+curl http://<your-unraid-ip>:8080/healthz
+```
+
+Expected response:
+
+```json
+{"status":"ok"}
+```
+
+## Updating
+
+If building from source:
+
+```bash
+cd /mnt/user/appdata/stellar
+git pull
+docker build -f docker/Dockerfile -t stellar:local .
+docker rm -f stellar
+docker run -d \
+  --name stellar \
+  --restart unless-stopped \
+  -p 8080:3000 \
+  -e PORT=3000 \
+  -e LOG_LEVEL=info \
+  stellar:local
+```
+
+If using compose:
+
+```bash
+cd /mnt/user/appdata/stellar
+git pull
+docker compose -f docker/docker-compose.yml up -d --build
+```
+
+## Notes
+
+- There is no persistent SQLite mount yet because M3 persistence has not been implemented.
+- When SQLite is added, bind-mount a host path such as `/mnt/user/appdata/stellar/data` into the container.
+- If Unraid already uses port `8080`, change the host-side port mapping and browse to that port instead.
+- Logs are written to container stdout/stderr and can be viewed from the Unraid Docker UI or with `docker logs stellar`.