feat: 社区准则改为数据库存储

- AuthController 注入 SiteSettings 依赖，RegisterPage 优先从 DB 读取准则
- DB 中 site.guidelines 为空时 fallback 到静态 guidelines.html 文件
- 管理后台站点设置页新增「内容管理」分区，textarea 编辑社区准则
- 添加准则编辑区垂直布局样式

templates/admin/html/site-settings/index.html

@@ -115,6 +115,23 @@
             </div>
         </div>
 
+        <!-- 内容管理 -->
+        <div class="settings-section">
+            <div class="section-title">内容管理</div>
+            <div class="section-body">
+                <div class="setting-item setting-item-vertical">
+                    <div class="setting-info">
+                        <span class="setting-label">社区准则</span>
+                        <span class="setting-desc">注册时需用户阅读并同意，支持 HTML 格式</span>
+                    </div>
+                    <div class="setting-input-block">
+                        <textarea id="setting-site-guidelines" class="setting-textarea" rows="12" placeholder="留空则使用默认准则文件"></textarea>
+                        <button class="btn btn-sm btn-primary btn-save-block" data-key="site.guidelines" data-input="setting-site-guidelines">保存准则</button>
+                    </div>
+                </div>
+            </div>
+        </div>
+
         <!-- 通用设置 -->
         <div class="settings-section">
             <div class="section-title">其他设置</div>

templates/admin/static/css/site-settings.css

@@ -58,6 +58,35 @@
 .btn-save { width: 56px; text-align: center; }
 .btn-save:disabled { opacity: 0.5; cursor: not-allowed; }
 
+/* --- 垂直布局设置项（用于准则等大文本） --- */
+.setting-item-vertical {
+    flex-direction: column; align-items: stretch;
+}
+.setting-item-vertical .setting-info {
+    margin-bottom: 10px;
+}
+.setting-input-block {
+    display: flex; flex-direction: column; gap: 10px;
+}
+.setting-textarea {
+    padding: 10px 12px;
+    border: 1px solid var(--border);
+    border-radius: 4px;
+    font-size: 13px; line-height: 1.6;
+    font-family: 'Courier New', Consolas, monospace;
+    resize: vertical;
+    width: 100%;
+    box-sizing: border-box;
+    outline: none;
+    transition: border-color 0.2s;
+}
+.setting-textarea:focus { border-color: var(--primary); }
+.btn-save-block {
+    align-self: flex-end;
+    min-width: 80px;
+}
+.btn-save-block:disabled { opacity: 0.5; cursor: not-allowed; }
+
 /* --- 空状态 --- */
 .settings-empty {
     text-align: center; padding: 28px 20px;

templates/admin/static/js/site-settings.js

@@ -18,6 +18,7 @@
     // 已有专属 UI 的设置 key，不在"其他设置"中重复显示
     var DEDICATED_KEYS = {
         'site.framework': true, 'site.copyright_start': true,
+        'site.guidelines': true,
         'maintenance.enabled': true,
         'registration.enabled': true,
         'audit.enabled': true, 'audit.username_audit': true, 'audit.avatar_audit': true, 'audit.bio_audit': true
@@ -51,6 +52,18 @@
             // 文本输入保存按钮
             bindSaveButtons();
 
+            // 社区准则文本域
+            var guidelinesEl = document.getElementById('setting-site-guidelines');
+            if (guidelinesEl) {
+                guidelinesEl.value = allSettings['site.guidelines'] || '';
+                var guidelinesBtn = document.querySelector('[data-key="site.guidelines"]');
+                if (guidelinesBtn) {
+                    guidelinesBtn.addEventListener('click', function() {
+                        updateTextSetting('site.guidelines', guidelinesEl.value, guidelinesBtn);
+                    });
+                }
+            }
+
             // 其他设置（过滤已有专属UI的key）
             renderOtherSettings(allSettings);
         } catch (e) {