diff --git a/README.md b/README.md
index 8747a49..bca96b2 100644
--- a/README.md
+++ b/README.md
@@ -193,9 +193,11 @@ npm install
 npm run dev
 ```
 
+默认会监听 `8451` 端口，并自动把 `/api`、`/media` 代理到 `http://localhost:8000`。
+
 ### 3. 打开页面
 
-- 前端：http://localhost:5173
+- 前端：http://localhost:8451
 - 后端：http://localhost:8000
 - 健康检查：http://localhost:8000/api/health
 
@@ -209,7 +211,7 @@ docker compose up --build
 
 启动后访问：
 
-- 前端：http://localhost:8080
+- 前端：http://localhost:8451
 - 后端 API：http://localhost:8000
 - 健康检查：http://localhost:8000/api/health
 
diff --git a/backend/Dockerfile b/backend/Dockerfile
index e8670d1..7093162 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,11 +1,18 @@
-FROM python:3.12-slim
+# syntax=docker/dockerfile:1.7
+
+FROM python:3.12-slim-bookworm
 
 ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
 
 WORKDIR /app/backend
 
-RUN apt-get update \
+RUN sed -i 's|deb.debian.org|mirrors.aliyun.com|g' /etc/apt/sources.list.d/debian.sources \
+  && sed -i 's|security.debian.org|mirrors.aliyun.com|g' /etc/apt/sources.list.d/debian.sources
+
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+  --mount=type=cache,target=/var/lib/apt,sharing=locked \
+  apt-get update \
   && apt-get install -y --no-install-recommends ffmpeg \
   && rm -rf /var/lib/apt/lists/*
 
diff --git a/backend/app/main.py b/backend/app/main.py
index 6ec58cc..4cfaf40 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -12,7 +12,7 @@ from app.services.tasks import task_manager
 
 
 def get_allowed_origins() -> List[str]:
-    origins = os.getenv("CORS_ORIGINS", "http://localhost:5173,http://localhost:8080")
+    origins = os.getenv("CORS_ORIGINS", "http://localhost:8451,http://localhost:8080")
     return [origin.strip() for origin in origins.split(",") if origin.strip()]
 
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 3df009d..a5c80e7 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -5,7 +5,7 @@ services:
       dockerfile: backend/Dockerfile
     container_name: vplatform-backend
     environment:
-      CORS_ORIGINS: http://localhost:5173,http://localhost:8080
+      CORS_ORIGINS: http://localhost:8451,http://localhost:8080
     ports:
       - "8000:8000"
     volumes:
@@ -22,5 +22,5 @@ services:
     depends_on:
       - backend
     ports:
-      - "8080:80"
+      - "8451:80"
     restart: unless-stopped
diff --git a/frontend/vite.config.js b/frontend/vite.config.js
index abccf69..4d91e9e 100644
--- a/frontend/vite.config.js
+++ b/frontend/vite.config.js
@@ -4,6 +4,17 @@ import react from '@vitejs/plugin-react'
 export default defineConfig({
   plugins: [react()],
   server: {
-    port: 5173,
+    host: '0.0.0.0',
+    port: 8451,
+    proxy: {
+      '/api': {
+        target: 'http://localhost:8000',
+        changeOrigin: true,
+      },
+      '/media': {
+        target: 'http://localhost:8000',
+        changeOrigin: true,
+      },
+    },
   },
 })