feat: add Tavily search provider

src/lib/llm/providers/tavily.ts

@@ -0,0 +1,69 @@
+export interface SearchResult {
+  title: string;
+  url: string;
+  content: string;
+  score: number;
+}
+
+const TAVILY_API_URL = "https://api.tavily.com/search";
+
+export async function searchItem(
+  itemName: string,
+  context: string
+): Promise<SearchResult[]> {
+  const apiKey = process.env.TAVILY_API_KEY;
+  if (!apiKey) {
+    return [];
+  }
+
+  try {
+    const query = `${itemName} ${context}`.trim();
+
+    const response = await fetch(TAVILY_API_URL, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify({
+        api_key: apiKey,
+        query,
+        max_results: 5,
+        include_answer: false,
+        search_depth: "advanced",
+      }),
+    });
+
+    if (!response.ok) {
+      console.error(
+        `Tavily API error: ${response.status} ${response.statusText}`
+      );
+      return [];
+    }
+
+    const data = await response.json();
+
+    if (!data.results || !Array.isArray(data.results)) {
+      return [];
+    }
+
+    return data.results.map(
+      (result: {
+        title?: string;
+        url?: string;
+        content?: string;
+        score?: number;
+      }) => ({
+        title: result.title ?? "",
+        url: result.url ?? "",
+        content: result.content ?? "",
+        score: result.score ?? 0,
+      })
+    );
+  } catch (error) {
+    console.error(
+      `Tavily search failed for "${itemName}":`,
+      error instanceof Error ? error.message : error
+    );
+    return [];
+  }
+}