feat: Docker, docker-compose, and deployment config (Task 13)

- Dockerfile: two-stage build (builder installs all deps + vite build; runtime copies dist + server)
- docker-compose.yml: 127.0.0.1:3004:8080, named volume for SQLite, env var interpolation
- .env.example: all required environment variables documented
- .dockerignore: exclude node_modules, dist, data, .env from build context
- vite.config.ts: outDir → ../client/dist, /api proxy to :3001 for dev
- .gitignore: remove Docker entries (files should be tracked for deployment)

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

docker-compose.yml

@@ -0,0 +1,21 @@
+services:
+  morsequest:
+    image: morsequest:latest
+    container_name: morsequest
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:3004:8080"
+    volumes:
+      - morsequest-data:/app/data
+    environment:
+      PORT: "8080"
+      NODE_ENV: production
+      SMTP_HOST: mail.keylinkit.net
+      SMTP_PORT: "587"
+      SMTP_USER: ${SMTP_USER}
+      SMTP_PASS: ${SMTP_PASS}
+      ADMIN_PASSWORD: ${ADMIN_PASSWORD}
+      APP_URL: https://morsequest.keylinkit.net
+
+volumes:
+  morsequest-data: