Update API and WebSocket base URLs to use environment variables for better configuration management

docker/docker-compose.yml

@@ -0,0 +1,16 @@
+version: "3.8"
+
+services:
+  mangtool:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile
+    image: mangtool:latest
+    container_name: mangtool
+    ports:
+      - "8080:8080"
+    restart: unless-stopped
+    # 如需挂载本地目录给工具读写，可取消注释并修改路径
+    # volumes:
+    #   - /path/on/host/Input:/app/data/Input
+    #   - /path/on/host/Library_Final:/app/data/Library_Final