docs: add Docker testing setup and instructions

README-TESTING.md

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+# Testing Channels-Seerr with Docker
+
+## Quick Start
+
+1. **Build and run:**
+   ```bash
+   docker-compose -f docker-compose.test.yml up --build
+   ```
+
+2. **Access the web UI:**
+   - Open browser: http://localhost:5055
+   - Complete the setup wizard
+   - Add your Channels DVR server in Settings
+
+3. **Stop:**
+   ```bash
+   docker-compose -f docker-compose.test.yml down
+   ```
+
+## Configuration
+
+- **Config directory:** `./config` (created automatically, persists settings)
+- **Logs:** `docker-compose logs -f seerr`
+- **Port:** Default 5055 (change in docker-compose.test.yml if needed)
+
+## Testing Channels DVR Integration
+
+1. Start Seerr container
+2. Navigate to Settings → Channels DVR
+3. Add your Channels DVR server:
+   - **Server URL:** http://your-channels-server:8089
+   - **Test connection** to verify
+4. Enable sync jobs (manual or scheduled)
+5. Check logs for sync activity:
+   ```bash
+   docker-compose -f docker-compose.test.yml logs -f seerr | grep -i channels
+   ```
+
+## Development Testing
+
+For faster iteration without full rebuilds:
+
+```bash
+# Use Dockerfile.local for development
+docker build -f Dockerfile.local -t channels-seerr:dev .
+docker run -p 5055:5055 -v ./config:/app/config channels-seerr:dev
+```
+
+## Troubleshooting
+
+**Build fails:**
+- Check Node.js version (requires 22.x)
+- Try: `docker-compose -f docker-compose.test.yml build --no-cache`
+
+**Can't connect to Channels DVR:**
+- If Channels is on host machine: Use `http://host.docker.internal:8089`
+- If on tailnet: Use the Tailscale IP
+- Check firewall allows connections from Docker network
+
+**Database issues:**
+- SQLite (default): Stored in `./config/db/db.sqlite3`
+- To use Postgres: Uncomment postgres service in docker-compose.test.yml

docker-compose.test.yml

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+version: '3.8'
+
+services:
+  seerr:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        COMMIT_TAG: channels-dvr-test
+    container_name: channels-seerr-test
+    hostname: seerr
+    ports:
+      - "5055:5055"
+    environment:
+      - LOG_LEVEL=debug
+      - TZ=America/Chicago
+    volumes:
+      - ./config:/app/config
+    restart: unless-stopped
+
+  # Optional: PostgreSQL for production-like testing
+  # Uncomment if you want to test with Postgres instead of SQLite
+  # postgres:
+  #   image: postgres:15-alpine
+  #   container_name: seerr-postgres
+  #   environment:
+  #     - POSTGRES_PASSWORD=seerr
+  #     - POSTGRES_USER=seerr
+  #     - POSTGRES_DB=seerr
+  #   volumes:
+  #     - postgres-data:/var/lib/postgresql/data
+  #   restart: unless-stopped
+
+# volumes:
+#   postgres-data: