feat(页面): 添加秘塔AI配置界面和聊天页面增强

设置页面:
- 新增秘塔AI配置区块
- 支持秘塔API Key的配置和清除
- 添加秘塔平台链接和工具使用说明

聊天页面:
- 从数据库加载搜索图片和使用工具数据
- 将数据传递给 MessageBubble 组件展示

src/app/chat/[id]/page.tsx

@@ -89,10 +89,14 @@ export default function ChatPage({ params }: PageProps) {
           outputTokens: msg.outputTokens || undefined,
           // 从数据库加载图片数据（代码执行产生的）
           images: (msg.images as string[]) || undefined,
+          // 从数据库加载搜索到的图片（图片搜索工具结果）
+          searchImages: (msg.searchImages as { title: string; imageUrl: string; width: number; height: number; score: string; position: number; sourceUrl?: string }[]) || undefined,
           // 从数据库加载用户上传的图片
           uploadedImages: (msg.uploadedImages as string[]) || undefined,
           // 从数据库加载用户上传的文档
           uploadedDocuments: (msg.uploadedDocuments as { name: string; size: number; type: string; content: string }[]) || undefined,
+          // 从数据库加载使用的工具列表
+          usedTools: (msg.usedTools as string[]) || undefined,
         }));
         setInitialMessages(historyMessages);
       }
@@ -563,8 +567,10 @@ export default function ChatPage({ params }: PageProps) {
                   isStreaming={message.status === 'streaming'}
                   error={message.error}
                   images={message.images}
+                  searchImages={message.searchImages}
                   uploadedImages={message.uploadedImages}
                   uploadedDocuments={message.uploadedDocuments}
+                  usedTools={message.usedTools}
                   pyodideStatus={message.pyodideStatus}
                   onRegenerate={message.role === 'assistant' && !isStreaming ? handleRegenerate : undefined}
                   onSaveToNote={message.role === 'assistant' && !isStreaming ? handleSaveToNote : undefined}

src/app/settings/page.tsx

@@ -56,6 +56,11 @@ export default function SettingsPage() {
   const [showApiKey, setShowApiKey] = useState(false);
   const [saveStatus, setSaveStatus] = useState<'idle' | 'saving' | 'saved' | 'error'>('idle');
 
+  // 秘塔AI 配置状态
+  const [metasoApiKey, setMetasoApiKey] = useState('');
+  const [showMetasoApiKey, setShowMetasoApiKey] = useState(false);
+  const [metasoSaveStatus, setMetasoSaveStatus] = useState<'idle' | 'saving' | 'saved' | 'error'>('idle');
+
   // AI 行为设置状态
   const [systemPrompt, setSystemPrompt] = useState('');
   const [temperature, setTemperature] = useState('0.7');
@@ -107,6 +112,31 @@ export default function SettingsPage() {
     }
   };
 
+  // 保存秘塔AI API Key
+  const handleSaveMetasoConfig = async () => {
+    setMetasoSaveStatus('saving');
+    try {
+      if (metasoApiKey) {
+        await updateSettings({ metasoApiKey });
+      }
+      setMetasoSaveStatus('saved');
+      setMetasoApiKey(''); // 清除输入的 API Key
+      setTimeout(() => setMetasoSaveStatus('idle'), 2000);
+    } catch {
+      setMetasoSaveStatus('error');
+      setTimeout(() => setMetasoSaveStatus('idle'), 2000);
+    }
+  };
+
+  // 清除秘塔 API Key
+  const handleClearMetasoApiKey = async () => {
+    try {
+      await updateSettings({ metasoApiKey: '' });
+    } catch (error) {
+      console.error('Failed to clear Metaso API key:', error);
+    }
+  };
+
   // 更新默认模型
   const handleModelChange = async (modelId: string) => {
     try {
@@ -476,6 +506,95 @@ export default function SettingsPage() {
               </div>
             </SettingsSection>
 
+            {/* 秘塔AI 配置 */}
+            <SettingsSection
+              title="秘塔AI 配置"
+              description="配置秘塔AI搜索和读取工具（可选）"
+            >
+              <SettingsItem
+                label="秘塔 API Key"
+                description={
+                  settings?.metasoApiKeyConfigured ? (
+                    '已配置秘塔 API Key'
+                  ) : (
+                    <span>
+                      配置后可使用 Metaso Search 和 Metaso Reader 工具。
+                      <a
+                        href="https://metaso.cn/"
+                        target="_blank"
+                        rel="noopener noreferrer"
+                        className="text-[var(--color-primary)] hover:underline ml-1"
+                      >
+                        前往秘塔平台获取 API Key →
+                      </a>
+                    </span>
+                  )
+                }
+              >
+                <div className="flex items-center gap-2">
+                  {settings?.metasoApiKeyConfigured ? (
+                    <>
+                      <span className="inline-flex items-center gap-1 text-sm text-green-600">
+                        <Check size={14} />
+                        已配置
+                      </span>
+                      <button
+                        onClick={handleClearMetasoApiKey}
+                        className="btn-ghost text-red-600 hover:text-red-700 text-sm"
+                        disabled={saving}
+                      >
+                        清除
+                      </button>
+                    </>
+                  ) : (
+                    <div className="relative">
+                      <input
+                        type={showMetasoApiKey ? 'text' : 'password'}
+                        className="settings-input pr-10 w-80"
+                        value={metasoApiKey}
+                        onChange={(e) => setMetasoApiKey(e.target.value)}
+                        placeholder="输入秘塔 API Key"
+                      />
+                      <button
+                        type="button"
+                        className="absolute right-3 top-1/2 -translate-y-1/2 text-[var(--color-text-tertiary)] hover:text-[var(--color-text-primary)]"
+                        onClick={() => setShowMetasoApiKey(!showMetasoApiKey)}
+                      >
+                        {showMetasoApiKey ? <EyeOff size={16} /> : <Eye size={16} />}
+                      </button>
+                    </div>
+                  )}
+                </div>
+              </SettingsItem>
+
+              {!settings?.metasoApiKeyConfigured && (
+                <div className="px-5 py-4 border-t border-[var(--color-border-light)]">
+                  <button
+                    onClick={handleSaveMetasoConfig}
+                    disabled={metasoSaveStatus === 'saving' || !metasoApiKey}
+                    className="btn-primary inline-flex items-center gap-2"
+                  >
+                    {metasoSaveStatus === 'saving' ? (
+                      <Loader2 size={16} className="animate-spin" />
+                    ) : metasoSaveStatus === 'saved' ? (
+                      <Check size={16} />
+                    ) : null}
+                    {metasoSaveStatus === 'saving' ? '保存中...' : metasoSaveStatus === 'saved' ? '已保存' : '保存秘塔配置'}
+                  </button>
+                  {metasoSaveStatus === 'error' && (
+                    <span className="ml-3 text-sm text-red-600">保存失败</span>
+                  )}
+                </div>
+              )}
+
+              <div className="px-5 py-3 bg-[var(--color-bg-tertiary)] border-t border-[var(--color-border-light)]">
+                <p className="text-xs text-[var(--color-text-tertiary)]">
+                  💡 秘塔工具说明：Metaso Search 提供高质量中文搜索，Metaso Reader 可将网页转换为结构化 Markdown。
+                  未配置 API Key 时，这些工具仍可选择但无法使用。
+                </p>
+              </div>
+            </SettingsSection>
+
             {/* 模型和工具设置 */}
             <SettingsSection
               title="AI 配置"