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>

prisma/migrations/20260320162355_add_lead_vault/migration.sql

@@ -0,0 +1,56 @@
+-- CreateTable
+CREATE TABLE "Lead" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "domain" TEXT,
+    "companyName" TEXT,
+    "contactName" TEXT,
+    "contactTitle" TEXT,
+    "email" TEXT,
+    "linkedinUrl" TEXT,
+    "phone" TEXT,
+    "sourceTab" TEXT NOT NULL,
+    "sourceTerm" TEXT,
+    "sourceJobId" TEXT,
+    "serpTitle" TEXT,
+    "serpSnippet" TEXT,
+    "serpRank" INTEGER,
+    "serpUrl" TEXT,
+    "emailConfidence" REAL,
+    "status" TEXT NOT NULL DEFAULT 'new',
+    "priority" TEXT NOT NULL DEFAULT 'normal',
+    "notes" TEXT,
+    "tags" TEXT,
+    "country" TEXT,
+    "headcount" TEXT,
+    "industry" TEXT,
+    "capturedAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "contactedAt" DATETIME,
+    "updatedAt" DATETIME NOT NULL
+);
+
+-- CreateTable
+CREATE TABLE "LeadEvent" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "leadId" TEXT NOT NULL,
+    "event" TEXT NOT NULL,
+    "at" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "LeadEvent_leadId_fkey" FOREIGN KEY ("leadId") REFERENCES "Lead" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- CreateIndex
+CREATE INDEX "Lead_domain_idx" ON "Lead"("domain");
+
+-- CreateIndex
+CREATE INDEX "Lead_status_idx" ON "Lead"("status");
+
+-- CreateIndex
+CREATE INDEX "Lead_sourceTab_idx" ON "Lead"("sourceTab");
+
+-- CreateIndex
+CREATE INDEX "Lead_capturedAt_idx" ON "Lead"("capturedAt");
+
+-- CreateIndex
+CREATE INDEX "Lead_email_idx" ON "Lead"("email");
+
+-- CreateIndex
+CREATE INDEX "LeadEvent_leadId_idx" ON "LeadEvent"("leadId");

prisma/schema.prisma

@@ -41,3 +41,57 @@ model LeadResult {
   source       String?
   createdAt    DateTime @default(now())
 }
+
+model Lead {
+  id              String    @id @default(cuid())
+
+  domain          String?
+  companyName     String?
+  contactName     String?
+  contactTitle    String?
+  email           String?
+  linkedinUrl     String?
+  phone           String?
+
+  sourceTab       String
+  sourceTerm      String?
+  sourceJobId     String?
+
+  serpTitle       String?
+  serpSnippet     String?
+  serpRank        Int?
+  serpUrl         String?
+
+  emailConfidence Float?
+
+  status          String    @default("new")
+  priority        String    @default("normal")
+  notes           String?
+
+  tags            String?
+  country         String?
+  headcount       String?
+  industry        String?
+
+  capturedAt      DateTime  @default(now())
+  contactedAt     DateTime?
+  updatedAt       DateTime  @updatedAt
+
+  events          LeadEvent[]
+
+  @@index([domain])
+  @@index([status])
+  @@index([sourceTab])
+  @@index([capturedAt])
+  @@index([email])
+}
+
+model LeadEvent {
+  id      String   @id @default(cuid())
+  leadId  String
+  lead    Lead     @relation(fields: [leadId], references: [id], onDelete: Cascade)
+  event   String
+  at      DateTime @default(now())
+
+  @@index([leadId])
+}