feat: implement user registration API and connect to UI

server/api/register.post.ts

@@ -0,0 +1,21 @@
+import { defineEventHandler, readBody, setResponseStatus } from 'h3';
+
+export default defineEventHandler(async (event) => {
+  const body = await readBody(event);
+
+  const { name, gender, contact, idCard, password } = body;
+
+  if (!name || !gender || !contact || !idCard || !password) {
+    setResponseStatus(event, 400);
+    return {
+      message: '请填写完整信息',
+    };
+  }
+
+  // TODO: Add database logic to save the user
+  console.log('Registering new user:', { name, gender, contact, idCard });
+
+  return {
+    message: '注册成功！',
+  };
+});