chore: add Docker deployment files, README, and Prisma migrations

- Add Dockerfile and docker-compose.yml for VPS/LXC deployment.
- Update README with setup, environment variables, and deployment notes.
- Commit initial Prisma migration for SQLite schema.
- Configure Next.js for standalone output and dev origin allowlist.

docker-compose.yml

@@ -0,0 +1,16 @@
+services:
+  app:
+    build: .
+    ports:
+      - "3000:3000"
+    environment:
+      DATABASE_URL: "file:./data/dev.db"
+      ADMIN_USERNAME: "${ADMIN_USERNAME:-admin}"
+      ADMIN_PASSWORD_HASH: "${ADMIN_PASSWORD_HASH}"
+      NEXTAUTH_SECRET: "${NEXTAUTH_SECRET}"
+      API_KEY_ENCRYPTION_SECRET: "${API_KEY_ENCRYPTION_SECRET}"
+      KIMI_API_URL: "${KIMI_API_URL:-https://api.moonshot.cn/v1}"
+      KIMI_MODEL: "${KIMI_MODEL:-moonshot-v1-8k}"
+    volumes:
+      - ./data:/app/data
+    restart: unless-stopped