feat(post): 新增手机图片排版与AI智能排版功能

- 新增手机图片排版功能，支持小红书/抖音尺寸输出
- 新增AI智能排版顾问，支持内容分析与优化推荐
- 新增AI供应商管理，支持多渠道配置与同步
- 新增文章输出管理页面，支持图片预览与批量下载
- 新增字体文件与排版样式配置

app/admin/controller/System.php

@@ -96,4 +96,91 @@ class System extends Common
 
       return $this->success('清楚成功');
     }
+
+    /**
+     * AI 设置页面.
+     */
+    public function ai()
+    {
+        return View::fetch();
+    }
+
+    /**
+     * 同步 models.dev 数据.
+     */
+    public function syncModelsDev()
+    {
+        $sync = new \app\common\tools\ai\ModelsDevSync();
+        try {
+            $result = $sync->syncProviders();
+            $count = count($result['providers'] ?? []);
+            return json(['code' => 0, 'msg' => "同步成功, 共{$count}个供应商", 'data' => $result]);
+        } catch (\Exception $e) {
+            return json(['code' => 500, 'msg' => '同步失败: ' . $e->getMessage()]);
+        }
+    }
+
+    /**
+     * 测试AI渠道连接.
+     */
+    public function testAiChannel()
+    {
+        $providerId = $this->request->param('provider_id', '');
+        if (empty($providerId)) {
+            return json(['code' => 500, 'msg' => '缺少供应商ID']);
+        }
+        $manager = new \app\common\tools\ai\AiChannelManager();
+        $provider = $manager->getProvider($providerId);
+        if (!$provider) {
+            return json(['code' => 500, 'msg' => '供应商未配置或缺少API Key']);
+        }
+        $ok = $provider->testConnection();
+        return json(['code' => $ok ? 0 : 500, 'msg' => $ok ? '连接成功' : '连接失败,请检查配置']);
+    }
+
+    /**
+     * 获取指定供应商的模型列表.
+     */
+    public function getModelsByProvider()
+    {
+        $providerId = $this->request->param('provider_id', '');
+        $sync = new \app\common\tools\ai\ModelsDevSync();
+        $models = $sync->getModelsByProvider($providerId);
+        return json(['code' => 0, 'data' => $models]);
+    }
+
+    /**
+     * 获取 models.dev 缓存状态.
+     */
+    public function getAiCacheStatus()
+    {
+        $sync = new \app\common\tools\ai\ModelsDevSync();
+        $status = $sync->getCacheStatus();
+        return json(['code' => 0, 'data' => $status]);
+    }
+
+    /**
+     * 保存AI渠道配置.
+     */
+    public function saveAiChannel()
+    {
+        $data = $this->request->post();
+        $manager = new \app\common\tools\ai\AiChannelManager();
+        $ok = $manager->saveChannelConfig($data);
+        return json(['code' => $ok ? 0 : 500, 'msg' => $ok ? '保存成功' : '保存失败']);
+    }
+
+    /**
+     * 删除AI渠道配置.
+     */
+    public function deleteAiChannel()
+    {
+        $providerId = $this->request->param('provider_id', '');
+        if (empty($providerId)) {
+            return json(['code' => 500, 'msg' => '缺少供应商ID']);
+        }
+        $manager = new \app\common\tools\ai\AiChannelManager();
+        $ok = $manager->deleteChannelConfig($providerId);
+        return json(['code' => $ok ? 0 : 500, 'msg' => $ok ? '删除成功' : '删除失败']);
+    }
 }