fix: Perplexity prompt rewrite + clinicName fallback via AI

Perplexity prompts changed from "find verified accounts" (returns all
null) to "search and report what you find" (returns actual handles).
Added clinicName resolution: Firecrawl Korean → English → Perplexity
URL-to-name lookup → domain fallback.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

supabase/functions/discover-channels/index.ts

@@ -147,7 +147,41 @@ Deno.serve(async (req) => {
     const brandData = brandResult.status === "fulfilled" ? brandResult.value : { data: { json: {} } };
 
     const clinic = scrapeData.data?.json || {};
-    const resolvedName = inputClinicName || clinic.clinicName || clinic.clinicNameEn || new URL(url).hostname.replace('www.', '').split('.')[0];
+    let resolvedName = inputClinicName || clinic.clinicName || "";
+
+    // If Firecrawl didn't extract a Korean name, try English name or domain
+    if (!resolvedName) {
+      resolvedName = clinic.clinicNameEn || "";
+    }
+
+    // Last resort: extract something readable from the domain
+    if (!resolvedName) {
+      const domain = new URL(url).hostname.replace('www.', '').split('.')[0];
+      // If Perplexity is available, ask it to identify the clinic name from the URL
+      if (PERPLEXITY_API_KEY) {
+        try {
+          const nameRes = await fetch("https://api.perplexity.ai/chat/completions", {
+            method: "POST",
+            headers: { "Content-Type": "application/json", Authorization: `Bearer ${PERPLEXITY_API_KEY}` },
+            body: JSON.stringify({
+              model: "sonar",
+              messages: [
+                { role: "system", content: "Respond with ONLY the clinic name in Korean, nothing else." },
+                { role: "user", content: `${url} 이 URL의 병원/클리닉 한국어 이름이 뭐야?` },
+              ],
+              temperature: 0.1,
+            }),
+          });
+          const nameData = await nameRes.json();
+          const aiName = (nameData.choices?.[0]?.message?.content || "").trim().replace(/["""]/g, '').split('\n')[0].trim();
+          if (aiName && aiName.length >= 2 && aiName.length <= 30) {
+            resolvedName = aiName;
+          }
+        } catch { /* fallback to domain */ }
+      }
+      if (!resolvedName) resolvedName = domain;
+    }
+
     const siteLinks: string[] = scrapeData.data?.links || [];
     const siteMap: string[] = mapData.links || [];
 
@@ -175,15 +209,15 @@ Deno.serve(async (req) => {
 
     if (PERPLEXITY_API_KEY && resolvedName) {
       const pResults = await Promise.allSettled([
-        // Query 1: Social media accounts — using clinic name, not URL
+        // Query 1: Social media accounts — search-based, not verification
         fetch("https://api.perplexity.ai/chat/completions", {
           method: "POST",
           headers: { "Content-Type": "application/json", Authorization: `Bearer ${PERPLEXITY_API_KEY}` },
           body: JSON.stringify({
             model: "sonar",
             messages: [
-              { role: "system", content: "You find official social media accounts for Korean medical clinics. Respond ONLY with valid JSON. If unsure, use null. Never guess or make up handles." },
-              { role: "user", content: `"${resolvedName}" 성형외과/병원의 공식 소셜 미디어 계정을 찾아줘. 인스타그램 계정이 여러개일 수 있어 (국문용, 영문용 등). 반드시 확인된 계정만 포함.\n\n{"instagram": ["핸들1", "핸들2"], "youtube": "채널 핸들 또는 URL (@ 포함)", "facebook": "페이지명 또는 URL", "tiktok": "핸들", "naverBlog": "블로그ID", "kakao": "채널ID"}` },
+              { role: "system", content: "You are a social media researcher. Search the web and find social media accounts. Respond ONLY with valid JSON, no explanation." },
+              { role: "user", content: `${resolvedName} 병원의 인스타그램, 유튜브, 페이스북, 틱톡, 네이버블로그, 카카오채널 계정을 검색해서 찾아줘. 검색 결과에서 발견된 계정을 모두 알려줘. 인스타그램은 여러 계정이 있을 수 있어.\n\n{"instagram": ["handle1", "handle2"], "youtube": "channel URL or @handle", "facebook": "page URL or name", "tiktok": "@handle", "naverBlog": "blog ID", "kakao": "channel ID"}` },
             ],
             temperature: 0.1,
           }),
@@ -196,8 +230,8 @@ Deno.serve(async (req) => {
           body: JSON.stringify({
             model: "sonar",
             messages: [
-              { role: "system", content: "You research Korean medical clinic platform presence. Respond ONLY with valid JSON." },
-              { role: "user", content: `"${resolvedName}" 성형외과/병원의 강남언니, 네이버 플레이스, 바비톡 등록 현황을 찾아줘.\n\n{"gangnamUnni": {"registered": true/false, "url": "gangnamunni.com URL 또는 null", "rating": 숫자/10 또는 null}, "naverPlace": {"registered": true/false}, "babitok": {"registered": true/false}}` },
+              { role: "system", content: "You are a medical platform researcher. Search the web for clinic listings. Respond ONLY with valid JSON, no explanation." },
+              { role: "user", content: `${resolvedName} 병원이 강남언니(gangnamunni.com), 네이버 플레이스, 바비톡에 등록되어 있는지 검색해줘. URL도 찾아줘.\n\n{"gangnamUnni": {"registered": true, "url": "https://gangnamunni.com/hospitals/...", "rating": 9.5}, "naverPlace": {"registered": true}, "babitok": {"registered": false}}` },
             ],
             temperature: 0.1,
           }),