feat: 添加邮件功能第二阶段 - 注册邮箱验证

实现注册时的邮箱验证功能：
- 修改注册API支持邮箱验证流程
- 新增邮箱验证API (/api/verify-email/<token>)
- 新增重发验证邮件API (/api/resend-verify-email)
- 新增邮箱验证状态查询API (/api/email/verify-status)

新增文件：
- templates/email/register.html - 注册验证邮件模板
- templates/verify_success.html - 验证成功页面
- templates/verify_failed.html - 验证失败页面

修改文件：
- email_service.py - 添加发送注册验证邮件函数
- app.py - 添加邮箱验证相关API
- database.py - 添加get_user_by_email函数
- app_config.py - 添加BASE_URL配置
- templates/register.html - 支持邮箱必填切换
- templates/login.html - 添加重发验证邮件功能
- templates/admin.html - 添加注册验证开关和BASE_URL设置

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

templates/register.html

@@ -173,9 +173,9 @@
             </div>
 
             <div class="form-group">
-                <label for="email">邮箱</label>
+                <label for="email">邮箱 <span id="emailRequired" style="color: #d63031; display: none;">*</span></label>
                 <input type="email" id="email" name="email">
-                <small>选填，用于接收审核通知</small>
+                <small id="emailHint">选填，用于接收审核通知</small>
             </div>
             <div class="form-group">
                 <label for="captcha">验证码</label>
@@ -196,7 +196,29 @@
 
     <script>
         let captchaSession = '';
-        window.onload = function() { generateCaptcha(); };
+        let emailVerifyEnabled = false;
+
+        window.onload = async function() {
+            await generateCaptcha();
+            await checkEmailVerifyStatus();
+        };
+
+        async function checkEmailVerifyStatus() {
+            try {
+                const resp = await fetch('/api/email/verify-status');
+                const data = await resp.json();
+                emailVerifyEnabled = data.register_verify_enabled;
+
+                if (emailVerifyEnabled) {
+                    document.getElementById('emailRequired').style.display = 'inline';
+                    document.getElementById('email').required = true;
+                    document.getElementById('emailHint').textContent = '必填，用于账号验证';
+                }
+            } catch (e) {
+                console.log('获取邮箱验证状态失败', e);
+            }
+        }
+
         async function handleRegister(event) {
             event.preventDefault();
 
@@ -229,6 +251,20 @@
                 return;
             }
 
+            // 邮箱验证启用时必填
+            if (emailVerifyEnabled && !email) {
+                errorDiv.textContent = '请填写邮箱地址用于账号验证';
+                errorDiv.style.display = 'block';
+                return;
+            }
+
+            // 邮箱格式验证
+            if (email && !email.includes('@')) {
+                errorDiv.textContent = '邮箱格式不正确';
+                errorDiv.style.display = 'block';
+                return;
+            }
+
             try {
                 const response = await fetch('/api/register', {
                     method: 'POST',
@@ -241,7 +277,12 @@
                 const data = await response.json();
 
                 if (response.ok) {
-                    successDiv.textContent = data.message || '注册成功，请等待管理员审核';
+                    // 根据是否需要邮箱验证显示不同的消息
+                    if (data.need_verify) {
+                        successDiv.innerHTML = data.message + '<br><small style="color: #666;">请检查您的邮箱（包括垃圾邮件文件夹）</small>';
+                    } else {
+                        successDiv.textContent = data.message || '注册成功，请等待管理员审核';
+                    }
                     successDiv.style.display = 'block';
 
                     // 清空表单
@@ -254,12 +295,14 @@
                 } else {
                     errorDiv.textContent = data.error || '注册失败';
                     errorDiv.style.display = 'block';
+                    refreshCaptcha();
                 }
             } catch (error) {
                 errorDiv.textContent = '网络错误，请稍后重试';
                 errorDiv.style.display = 'block';
             }
         }
+
         async function generateCaptcha() {
             const resp = await fetch('/api/generate_captcha', {method: 'POST', headers: {'Content-Type': 'application/json'}});
             const data = await resp.json();
@@ -268,6 +311,7 @@
                 document.getElementById('captchaImage').src = data.captcha_image;
             }
         }
+
         async function refreshCaptcha() { await generateCaptcha(); document.getElementById('captcha').value = ''; }
     </script>
 </body>