fix: auto initialize database on Docker build

Dockerfile

@@ -38,6 +38,10 @@ RUN mkdir -p /app/data && chmod 777 /app/data
 # 复制 node_modules
 COPY --from=builder /app/node_modules ./node_modules
 
+# 设置数据库环境变量并初始化数据库
+ENV DATABASE_URL="file:./data/student.db"
+RUN npx prisma db push
+
 # 复制 Prisma
 COPY --from=builder /app/prisma ./prisma