feat: LeadVault - zentrale Lead-Datenbank mit CRM-Funktionen

- Prisma-Schema: Lead + LeadEvent Modelle (Migration 20260320)
- lib/services/leadVault.ts: sinkLeadsToVault mit Deduplizierung
- Auto-Sync: alle 4 Pipelines schreiben Leads in LeadVault
- GET /api/leads: Filter, Sortierung, Pagination (Server-side)
- PATCH/DELETE /api/leads/[id]: Status, Priorität, Tags, Notizen
- POST /api/leads/bulk: Bulk-Aktionen für mehrere Leads
- GET /api/leads/stats: Statistiken + 7-Tage-Sparkline
- POST /api/leads/quick-serp: SERP-Capture ohne Enrichment
- GET /api/leads/export: CSV-Export mit allen Feldern
- app/leadvault/page.tsx: vollständige UI mit Stats, Quick SERP,
  Filter-Leiste, sortierbare Tabelle, Bulk-Aktionen, Side Panel
- Sidebar: LeadVault-Eintrag mit Live-Badge (neue Leads)

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

app/api/leads/bulk/route.ts

@@ -0,0 +1,64 @@
+import { NextRequest, NextResponse } from "next/server";
+import { prisma } from "@/lib/db";
+
+export async function POST(req: NextRequest) {
+  try {
+    const body = await req.json() as {
+      ids: string[];
+      action: "status" | "priority" | "tag" | "delete";
+      value: string;
+    };
+    const { ids, action, value } = body;
+
+    if (!ids?.length) return NextResponse.json({ error: "No IDs provided" }, { status: 400 });
+
+    if (action === "delete") {
+      const { count } = await prisma.lead.deleteMany({ where: { id: { in: ids } } });
+      return NextResponse.json({ updated: count });
+    }
+
+    if (action === "status") {
+      const { count } = await prisma.lead.updateMany({
+        where: { id: { in: ids } },
+        data: { status: value },
+      });
+      // Create events for status change
+      for (const id of ids) {
+        await prisma.leadEvent.create({
+          data: { leadId: id, event: `Status geändert zu "${value}" (Bulk)` },
+        }).catch(() => {}); // ignore if lead was deleted
+      }
+      return NextResponse.json({ updated: count });
+    }
+
+    if (action === "priority") {
+      const { count } = await prisma.lead.updateMany({
+        where: { id: { in: ids } },
+        data: { priority: value },
+      });
+      return NextResponse.json({ updated: count });
+    }
+
+    if (action === "tag") {
+      // Add tag to each lead's tags JSON array
+      const leads = await prisma.lead.findMany({ where: { id: { in: ids } }, select: { id: true, tags: true } });
+      let count = 0;
+      for (const lead of leads) {
+        const existing: string[] = JSON.parse(lead.tags || "[]");
+        if (!existing.includes(value)) {
+          await prisma.lead.update({
+            where: { id: lead.id },
+            data: { tags: JSON.stringify([...existing, value]) },
+          });
+          count++;
+        }
+      }
+      return NextResponse.json({ updated: count });
+    }
+
+    return NextResponse.json({ error: "Unknown action" }, { status: 400 });
+  } catch (err) {
+    console.error("POST /api/leads/bulk error:", err);
+    return NextResponse.json({ error: "Bulk action failed" }, { status: 500 });
+  }
+}