refactor: 统一 AI 搜索与传统搜索布局，并简化 n8n 响应格式处理

- API 只支持 n8n 返回的 {results: [{id, similarity}]} 格式
- AI 搜索结果改用网格布局，与传统搜索保持一致
- 用右上角相似度徽章替代左侧彩色条和黄色高亮框
- 移除顶部的匹配度说明，徽章颜色直观显示匹配质量

Co-Authored-By: Claude (glm-4.7) <noreply@anthropic.com>

src/app/api/search/ai/route.ts

@@ -9,13 +9,15 @@ if (!N8N_WEBHOOK_URL) {
   throw new Error('N8N_AI_SEARCH_WEBHOOK environment variable is not set')
 }
 
-// n8n 返回的简化搜索结果 Schema
-const N8NSearchResultSchema = z.array(
-  z.object({
-    id: z.string(),
-    similarity: z.number(),
-  })
-)
+// n8n 返回的搜索结果 Schema（统一格式）
+const N8NSearchResponseSchema = z.object({
+  results: z.array(
+    z.object({
+      id: z.string(),
+      similarity: z.number(),
+    })
+  ),
+})
 
 export async function POST(request: Request) {
   try {
@@ -50,20 +52,9 @@ export async function POST(request: Request) {
     // n8n 返回数据
     const n8nData = await n8nResponse.json()
 
-    // 兼容多种返回格式
-    let n8nResults: Array<{ id: string; similarity: number }>
-    if (Array.isArray(n8nData)) {
-      // 数组格式: [{ id: "...", similarity: 0.59 }]
-      n8nResults = N8NSearchResultSchema.parse(n8nData)
-    } else if (n8nData.id && typeof n8nData.similarity === 'number') {
-      // 单个对象格式: { id: "...", similarity: 0.59 }
-      n8nResults = [n8nData as { id: string; similarity: number }]
-    } else if (n8nData.data && Array.isArray(n8nData.data)) {
-      // 包装在 data 字段: { data: [{ id: "...", similarity: 0.59 }] }
-      n8nResults = N8NSearchResultSchema.parse(n8nData.data)
-    } else {
-      throw new Error('Invalid n8n response format')
-    }
+    // 解析 n8n 响应（只支持 {results: [{id, similarity}, ...]} 格式）
+    const parsed = N8NSearchResponseSchema.parse(n8nData)
+    const n8nResults = parsed.results
 
     if (n8nResults.length === 0) {
       return NextResponse.json({ projects: [], pagination: { total: 0, page: 1, limit: validatedQuery.limit || 20 } })
@@ -75,9 +66,6 @@ export async function POST(request: Request) {
     // 从数据库批量获取完整项目数据
     const projects = await getProjectsByIds(projectIds)
 
-    // 创建 similarity 映射表（ID -> similarity）
-    const similarityMap = new Map(n8nResults.map((r) => [r.id, r.similarity]))
-
     // 将 similarity 合并到项目数据中，并按 n8n 返回的顺序排序
     const results: AISearchResultItem[] = n8nResults
       .map((n8nItem) => {

src/components/search/AISearchResults.tsx

@@ -33,44 +33,24 @@ export function AISearchResults({ results, locale, translations }: AISearchResul
   }
 
   return (
-    <div className="space-y-6">
-      {/* 相似度说明 */}
-      <div className="flex items-center gap-3 px-4 py-3 bg-gray-50 dark:bg-gray-900 border-l-4 border-primary rounded-r font-display text-sm">
-        <span className="font-semibold text-gray-700 dark:text-gray-300">匹配度：</span>
-        <div className="flex items-center gap-2">
-          <span className="text-green-600 font-bold">高</span>
-          <span className="text-gray-400">→</span>
-          <span className="text-red-600 font-bold">低</span>
-        </div>
-      </div>
-
-      {/* 结果列表 */}
-      {results.map(({ project, similarity, matchReason }) => (
+    <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-8">
+      {results.map(({ project, similarity }) => (
         <div key={project.id} className="relative">
-          {/* 相似度指示条 */}
-          <div
-            className="absolute left-0 top-0 bottom-0 w-1.5 rounded-l"
-            style={{
-              backgroundColor: getSimilarityColor(similarity)
-            }}
-          />
-
-          {/* 项目卡片 */}
-          <div className="ml-3">
-            <ProjectCard project={project} locale={locale} translations={translations} />
-
-            {/* AI 匹配信息 */}
-            <div className="mt-3 px-4 py-3 bg-yellow-50 dark:bg-yellow-900/20 border-l-4 border-yellow-400 dark:border-yellow-500 rounded-r">
-              <div className="flex flex-col sm:flex-row justify-between items-start sm:items-center gap-2 text-sm font-display">
-                <span className="font-semibold text-gray-700 dark:text-gray-300">
-                  匹配度: {(similarity * 100).toFixed(0)}%
-                </span>
-                {matchReason && (
-                  <span className="text-gray-600 dark:text-gray-400">{matchReason}</span>
-                )}
-              </div>
+          {/* 相似度徽章 */}
+          <div className="absolute -top-3 -right-3 z-10">
+            <div
+              className="px-3 py-1.5 rounded-full border-2 border-black dark:border-gray-600 shadow-neo-sm font-display font-bold text-xs"
+              style={{
+                backgroundColor: getSimilarityColor(similarity),
+                color: getSimilarityTextColor(similarity),
+              }}
+            >
+              {(similarity * 100).toFixed(0)}%
             </div>
           </div>
+
+          {/* 项目卡片 */}
+          <ProjectCard project={project} locale={locale} translations={translations} />
         </div>
       ))}
     </div>
@@ -78,8 +58,15 @@ export function AISearchResults({ results, locale, translations }: AISearchResul
 }
 
 function getSimilarityColor(score: number): string {
-  if (score > 0.8) return '#22c55e' // green-500
-  if (score > 0.6) return '#eab308' // yellow-500
-  if (score > 0.4) return '#f97316' // orange-500
-  return '#ef4444' // red-500
+  if (score > 0.8) return '#dcfce7' // green-100
+  if (score > 0.6) return '#fef9c3' // yellow-100
+  if (score > 0.4) return '#fed7aa' // orange-100
+  return '#fecaca' // red-100
+}
+
+function getSimilarityTextColor(score: number): string {
+  if (score > 0.8) return '#166534' // green-800
+  if (score > 0.6) return '#854d0e' // yellow-800
+  if (score > 0.4) return '#9a3412' // orange-800
+  return '#991b1b' // red-800
 }