feat: 优化导航栏布局，改进股票搜索结果展示为响应式网格，并更新Gemini模型选项。

frontend/src/app/config/page.tsx

@@ -73,8 +73,8 @@ export default function ConfigPage() {
                             >
                                 <option value="gemini-2.0-flash">Gemini 2.0 Flash</option>
                                 <option value="gemini-2.5-flash">Gemini 2.5 Flash</option>
-                                <option value="gemini-3-flash">Gemini 3 Flash</option>
-                                <option value="gemini-3-pro">Gemini 3 Pro</option>
+                                <option value="gemini-3-flash-preview">Gemini 3 Flash Preview</option>
+                                <option value="gemini-3-pro-preview">Gemini 3 Pro Preview</option>
                                 <option value="custom">自定义模型...</option>
                             </select>
                             <Button onClick={() => handleSave("AI_MODEL", config["AI_MODEL"])}>保存</Button>

frontend/src/app/page.tsx

@@ -7,7 +7,7 @@ export default function Home() {
       <div className="flex flex-col gap-4">
         <h1 className="text-3xl font-bold tracking-tight">股票分析</h1>
         <p className="text-muted-foreground">
-          输入公司名称或股票代码，开始全面的AI驱动的分析。
+          输入公司名称或股票代码，开始全面的AI驱动的分析。支持中国、香港、美国、日本的公司分析。
         </p>
       </div>
 

frontend/src/components/nav-header.tsx

@@ -5,7 +5,8 @@ import { MonitorPlay } from "lucide-react"
 
 export function NavHeader() {
     return (
-        <header className="flex h-14 items-center gap-4 border-b bg-muted/40 px-6 lg:h-[60px]">
+        <header className="border-b bg-muted/40">
+            <div className="flex h-14 items-center gap-4 px-6 lg:h-[60px] max-w-7xl mx-auto">
                 <Link className="flex items-center gap-2 font-semibold" href="/">
                     <MonitorPlay className="h-6 w-6" />
                     <span className="">股票分析 AI</span>
@@ -18,6 +19,7 @@ export function NavHeader() {
                         配置
                     </Link>
                 </nav>
+            </div>
         </header>
     )
 }

frontend/src/components/search-stock.tsx

@@ -68,20 +68,20 @@ export function SearchStock() {
                         {results.length > 1 && (
                             <div className="text-sm text-muted-foreground">找到 {results.length} 个结果，请选择：</div>
                         )}
+                        <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
                             {results.map((result, index) => (
-                            <div key={index} className="bg-muted p-4 rounded-md space-y-2 border hover:border-primary transition-colors">
-                                <div className="font-medium text-lg">{result.company_name}</div>
-                                <div className="text-sm text-muted-foreground">
-                                    市场: {result.market} | 代码: {result.symbol}
+                                <div key={index} className="bg-muted p-3 rounded-md space-y-2 border hover:border-primary transition-colors">
+                                    <div className="font-medium">{result.company_name}</div>
+                                    <div className="text-xs text-muted-foreground">
+                                        {result.market} | {result.symbol}
                                     </div>
-                                <div className="pt-2">
-                                    <Button onClick={() => handleAnalyze(result)} disabled={loading} className="w-full">
+                                    <Button onClick={() => handleAnalyze(result)} disabled={loading} className="w-full" size="sm">
                                         {loading ? "正在启动分析..." : "运行分析"}
                                     </Button>
                                 </div>
-                            </div>
                             ))}
                         </div>
+                    </div>
                 )}
             </CardContent>
         </Card>