feat: 注册准则阅读控制 + Footer 合规信息

准则阅读（三层控制）：
- registration.show_guidelines — 弹窗/复选框模式
- registration.force_guidelines — 是否强制倒计时+滚动
- registration.guidelines_timer — 倒计时秒数

Footer 合规（8 字段，空值不显示，链接纯手写）：
- site.operator_name / site.icp_number / site.icp_license
- site.police_number / site.wenwangwen / site.algorithm_filing
- site.privacy_url / site.terms_url
- 新增 safeHTML 模板函数输出不转义 HTML

templates/MetaLab-2026/static/js/register.js

@@ -25,6 +25,7 @@
     var passwordInput = document.getElementById('password');
     var confirmPasswordInput = document.getElementById('confirmPassword');
     var rememberMeCheckbox = document.getElementById('rememberMe');
+    var guidelinesAgreedCheckbox = document.getElementById('guidelinesAgreed');
     var emailError = document.getElementById('emailError');
     var passwordError = document.getElementById('passwordError');
     var confirmPasswordError = document.getElementById('confirmPasswordError');
@@ -32,6 +33,11 @@
     // Guard: exit if not on auth page
     if (!registerForm) return;
 
+    // 准则配置（从模板 data 属性读取）
+    var forceGuidelines = modalOverlay ? modalOverlay.getAttribute('data-force-guidelines') === 'true' : true;
+    var guidelinesTimer = modalOverlay ? parseInt(modalOverlay.getAttribute('data-guidelines-timer')) || 60 : 60;
+    var showModal = !!modalOverlay;
+
     // 读取 redirect 参数（注册成功后跳转目标）
     function getRedirect() {
         var m = window.location.search.match(/[?&]redirect=([^&]+)/);
@@ -39,7 +45,7 @@
         return '/';
     }
 
-    var countdown = 60;
+    var countdown = guidelinesTimer;
     var timerInterval = null;
     var reachedBottom = false;
     var agreed = false;
@@ -50,7 +56,7 @@
     function openModal(onAgreed) {
         isRegistrationMode = typeof onAgreed === 'function';
         clearInterval(timerInterval);
-        countdown = 60;
+        countdown = guidelinesTimer;
         reachedBottom = false;
         agreed = false;
         modalBody.scrollTop = 0;
@@ -61,18 +67,25 @@
             modalEnforce.style.display = '';
             confirmBtn.style.display = '';
             previewCloseBtn.style.display = 'none';
-            timerCount.textContent = '60';
-            timerLabel.style.display = '';
-            timerCount.style.display = '';
-            timerUnit.style.display = '';
-            timerDone.style.display = 'none';
-            timer.classList.remove('done');
-            countdownPaused = false;
-            confirmBtn.disabled = true;
-            scrollHint.style.display = 'flex';
-            scrollHint.textContent = '▼ 请滚动至底部完成阅读';
-            scrollHint.style.color = 'var(--color-danger)';
-            startCountdown();
+
+            if (forceGuidelines) {
+                timerCount.textContent = guidelinesTimer;
+                timerLabel.style.display = '';
+                timerCount.style.display = '';
+                timerUnit.style.display = '';
+                timerDone.style.display = 'none';
+                if (timer) timer.classList.remove('done');
+                countdownPaused = false;
+                confirmBtn.disabled = true;
+                scrollHint.style.display = 'flex';
+                scrollHint.textContent = '▼ 请滚动至底部完成阅读';
+                scrollHint.style.color = 'var(--color-danger)';
+                startCountdown();
+            } else {
+                // 非强制：隐藏倒计时和滚动提示，按钮直接可用
+                modalEnforce.style.display = 'none';
+                confirmBtn.disabled = false;
+            }
         } else {
             modalEnforce.style.display = 'none';
             confirmBtn.style.display = 'none';
@@ -239,37 +252,46 @@
             return;
         }
 
+        // 复选框模式：检查是否勾选准则
+        if (guidelinesAgreedCheckbox && !guidelinesAgreedCheckbox.checked) {
+            window.MetaLab.toast(toast, '请先阅读并同意社区准则', true);
+            return;
+        }
+
         // Disable submit to prevent double-click
         submitBtn.disabled = true;
         submitBtn.textContent = '检查中...';
 
-        // Step 1: Check if email already registered (before showing 60s guidelines)
+        // Step 1: Check if email already registered
         var checkXhr = new XMLHttpRequest();
         checkXhr.open('POST', '/api/auth/check-email', true);
         checkXhr.setRequestHeader('Content-Type', 'application/json');
         checkXhr.onreadystatechange = function () {
             if (checkXhr.readyState !== 4) return;
 
-            submitBtn.disabled = true; // will be re-enabled by checkFormValidity if needed
+            submitBtn.disabled = true;
 
             var resp;
             try { resp = JSON.parse(checkXhr.responseText); } catch (err) { resp = null; }
 
             if (checkXhr.status === 200 && resp && resp.success) {
                 if (resp.data && resp.data.exists) {
-                    // Already registered → notify user immediately, skip guidelines
                     window.MetaLab.toast(toast, '该邮箱已注册，请直接登录', true);
                     submitBtn.textContent = '注 册';
                     submitBtn.disabled = false;
                 } else {
-                    // Not registered → proceed to guidelines modal
                     submitBtn.textContent = '注 册';
-                    openModal(function () {
+                    if (showModal) {
+                        // 弹窗模式：弹出准则阅读
+                        openModal(function () {
+                            doRegister(email, password, confirm);
+                        });
+                    } else {
+                        // 复选框模式：直接注册
                         doRegister(email, password, confirm);
-                    });
+                    }
                 }
             } else {
-                // API error → show message, don't block
                 var msg = (resp && resp.message) ? resp.message : '网络异常，请稍后重试';
                 window.MetaLab.toast(toast, msg, true);
                 submitBtn.textContent = '注 册';