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/jobs/linkedin-enrich/route.ts

@@ -1,6 +1,7 @@
 import { NextRequest, NextResponse } from "next/server";
 import { prisma } from "@/lib/db";
 import { getApiKey } from "@/lib/utils/apiKey";
+import { sinkLeadsToVault } from "@/lib/services/leadVault";
 import {
   submitBulkPersonSearch,
   getBulkSearchStatus,
@@ -150,6 +151,23 @@ async function runLinkedInEnrich(
       where: { id: enrichJobId },
       data: { status: "complete", emailsFound },
     });
+
+    // Sync final state to LeadVault
+    const finalResults = await prisma.leadResult.findMany({ where: { jobId: enrichJobId } });
+    await sinkLeadsToVault(
+      finalResults.map(r => ({
+        domain: r.domain,
+        companyName: r.companyName,
+        contactName: r.contactName,
+        contactTitle: r.contactTitle,
+        email: r.email,
+        linkedinUrl: r.linkedinUrl,
+        emailConfidence: r.confidence,
+      })),
+      "linkedin",
+      undefined,
+      enrichJobId,
+    );
   } catch (err) {
     const message = err instanceof Error ? err.message : String(err);
     await prisma.job.update({