feat(i18n): add multilingual support with translations for English, Japanese, and Simplified Chinese

- Create README.md for internationalization (i18n) documentation
- Add English translation for main README and quick start guide
- Add Japanese translation for main README
- Add Simplified Chinese translation for main README
- Introduce sample Docker Compose configurations for various deployment scenarios
- Implement CI/CD documentation for testing and deployment workflows
- Establish end-to-end testing guidelines and strategies
- Create test strategy documentation outlining unit, integration, and E2E tests

docs/samples/compose.minimal.yml

@@ -0,0 +1,15 @@
+# ConvertX-CN 最小配置
+# 適用於：快速測試、個人使用
+
+services:
+  convertx:
+    image: convertx/convertx-cn:latest
+    container_name: convertx-cn
+    restart: unless-stopped
+    ports:
+      - "3000:3000"
+    volumes:
+      - ./data:/app/data
+    environment:
+      - TZ=Asia/Taipei
+      - JWT_SECRET=請更換為長且隨機的字串至少32字元