refactor: 替换 console.log 为统一日志工具（任务 3.2/20）

src/app/(marketing)/contact/actions.ts

@@ -2,6 +2,9 @@
 
 import { Resend } from 'resend';
 import { z } from 'zod';
+import { logger } from '@/lib/logger';
+
+const log = logger.child('ContactForm');
 
 const companyEmail = process.env.COMPANY_EMAIL || 'contact@novalon.cn';
 
@@ -69,14 +72,14 @@ export async function submitContactForm(
   const data = validationResult.data;
 
   if (data.website) {
-    console.log('Honeypot field filled, rejecting request');
+    log.warn('Honeypot field filled, rejecting request');
     return { success: true, message: '消息已发送' };
   }
 
   if (data.submitTime) {
     const timeDiff = Date.now() - parseInt(data.submitTime);
     if (timeDiff < 2000) {
-      console.log('Submission too fast:', timeDiff);
+      log.warn('Submission too fast:', timeDiff);
       return { success: false, error: '提交过快，请稍后再试' };
     }
   }
@@ -84,7 +87,7 @@ export async function submitContactForm(
   if (data.mathHash && data.mathTimestamp && data.mathAnswer !== undefined) {
     const expectedHash = btoa(`${data.mathAnswer}-${data.mathTimestamp}`);
     if (expectedHash !== data.mathHash) {
-      console.log('Invalid math captcha');
+      log.warn('Invalid math captcha');
       return { success: false, error: '验证码错误，请重新计算' };
     }
   }
@@ -269,7 +272,7 @@ export async function submitContactForm(
       return { success: false, error: '邮件发送失败，请稍后重试' };
     }
 
-    console.log('Email sent successfully:', emailData);
+    log.info('Email sent successfully:', emailData);
     return { success: true, message: '消息已发送' };
   } catch (error) {
     console.error('Contact form submission error:', error);

src/app/admin/users/page.tsx

@@ -1,6 +1,9 @@
 'use client';
 
 import { useState, useEffect } from 'react';
+import { logger } from '@/lib/logger';
+
+const log = logger.child('AdminUsers');
 import { 
   Users as UsersIcon, 
   Plus, 
@@ -96,7 +99,7 @@ export default function UsersPage() {
 
   const handleDelete = async (userId: string) => {
     if (deletingUserId) {
-      console.log('删除操作正在进行中，请勿重复点击');
+      log.warn('删除操作正在进行中，请勿重复点击');
       return;
     }