fix: add frontend build stage to Dockerfile, update npm install to include devDependencies

Dockerfile

@@ -1,5 +1,22 @@
-# 构建阶段 - 使用 Debian 基础镜像
-FROM golang:1.22-bookworm AS builder
+# 前端构建阶段
+FROM node:20-alpine AS frontend-builder
+
+WORKDIR /app/web
+
+# 复制前端依赖文件
+COPY web/package*.json ./
+
+# 安装依赖
+RUN npm install --registry https://registry.npmmirror.com
+
+# 复制前端源代码
+COPY web/ ./
+
+# 构建前端
+RUN npm run build
+
+# 后端构建阶段 - 使用 Debian 基础镜像
+FROM golang:1.22-bookworm AS backend-builder
 
 # 安装 OpenCV、ONNX Runtime 和编译工具
 RUN apt-get update && apt-get install -y --no-install-recommends \
@@ -48,13 +65,15 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     && rm -rf /var/lib/apt/lists/*
 
 # 复制 ONNX Runtime
-COPY --from=builder /usr/local/onnxruntime/lib/libonnxruntime.so* /usr/lib/
+COPY --from=backend-builder /usr/local/onnxruntime/lib/libonnxruntime.so* /usr/lib/
 
 WORKDIR /app
 
-# 复制二进制文件和前端
-COPY --from=builder /app/anticaptcha .
-COPY --from=builder /app/web/dist ./web/dist
+# 复制二进制文件
+COPY --from=backend-builder /app/anticaptcha .
+
+# 复制前端构建产物
+COPY --from=frontend-builder /app/web/dist ./web/dist
 
 # 创建数据和模型目录（模型启动时自动下载）
 RUN mkdir -p /app/data /app/models