feat: Kundensuche – Progressbar, SERP-Supplement, Dedup, Löschen, Neu-Filter

- Progressbar geht nie mehr rückwärts (Math.min-Cap entfernt)
- E-Mails-suchen-Phase wird immer kurz angezeigt bevor Fertig
- SERP-Supplement startet automatisch wenn Maps < Zielanzahl liefert
- Suchergebnisse bleiben nach Abschluss sichtbar (kein Redirect)
- Dedup in leadVault strikt nach Domain (verhindert Duplikate)
- isNew-Flag pro Result (Batch-Query gegen bestehende Vault-Domains)
- Nur-neue-Filter + vorhanden-Badge in Suchergebnissen
- Einzeln und Bulk löschen aus Suchergebnissen + Leadspeicher
- Fehlermeldung zeigt echten API-Fehler (z.B. 402 Anymailfinder)
- SERP-Supplement aus /api/search entfernt (LoadingCard übernimmt)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/api/leads/delete-from-results/route.ts

@@ -0,0 +1,36 @@
+import { NextRequest, NextResponse } from "next/server";
+import { prisma } from "@/lib/db";
+
+// Deletes vault leads that were created from the given job result IDs.
+// Looks up domain from each LeadResult and removes matching Lead records.
+export async function POST(req: NextRequest) {
+  try {
+    const { resultIds } = await req.json() as { resultIds: string[] };
+
+    if (!resultIds?.length) {
+      return NextResponse.json({ error: "No result IDs provided" }, { status: 400 });
+    }
+
+    // Get domains from the job results
+    const results = await prisma.leadResult.findMany({
+      where: { id: { in: resultIds } },
+      select: { id: true, domain: true, email: true },
+    });
+
+    const domains = results.map(r => r.domain).filter((d): d is string => !!d);
+
+    // Delete vault leads with matching domains
+    let deleted = 0;
+    if (domains.length > 0) {
+      const { count } = await prisma.lead.deleteMany({
+        where: { domain: { in: domains } },
+      });
+      deleted = count;
+    }
+
+    return NextResponse.json({ deleted });
+  } catch (err) {
+    console.error("POST /api/leads/delete-from-results error:", err);
+    return NextResponse.json({ error: "Delete failed" }, { status: 500 });
+  }
+}