chore(server): add infrastructure for running Nginx Proxy Manager

apps/server/docker/nginx-proxy-manager/README.md

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+# Nginx Proxy Manager (for testing reverse proxy setups)
+
+## Quick start
+
+1. Start Trilium on the host (default port 8080):
+   ```bash
+   pnpm run server:start
+   ```
+
+2. Start Nginx Proxy Manager:
+   ```bash
+   docker compose up -d
+   ```
+
+3. Open the NPM admin panel at **http://localhost:8081** and log in with:
+   - Email: `admin@example.com`
+   - Password: `changeme`
+   (You'll be asked to change these on first login.)
+
+4. Add a proxy host:
+   - **Domain Names**: `localhost`
+   - **Scheme**: `http`
+   - **Forward Hostname / IP**: `host.docker.internal`
+   - **Forward Port**: `8080`
+   - Enable **Websockets Support** (required for Trilium sync)
+
+5. Access Trilium through NPM at **http://localhost:8090**.
+
+## With a subpath
+
+To test Trilium behind a subpath (e.g. `/trilium/`), add a **Custom Nginx Configuration** in NPM under the **Advanced** tab of the proxy host:
+
+```nginx
+location /trilium/ {
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection "upgrade";
+    proxy_pass http://host.docker.internal:8080/;
+    proxy_cookie_path / /trilium/;
+    proxy_read_timeout 90;
+}
+```
+
+## Cleanup
+
+```bash
+docker compose down -v
+```

apps/server/docker/nginx-proxy-manager/docker-compose.yml

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+services:
+  nginx-proxy-manager:
+    image: "jc21/nginx-proxy-manager:latest"
+    restart: unless-stopped
+    ports:
+      # Public HTTP port
+      - "8090:80"
+      # Admin panel
+      - "8081:81"
+    volumes:
+      - npm_data:/data
+      - npm_letsencrypt:/etc/letsencrypt
+    # Use host network mode so NPM can reach Trilium on the host.
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+
+volumes:
+  npm_data:
+  npm_letsencrypt: