feat: Vendor-level consent + Consent analytics (F4 + F6)

F4: Granular Vendor-Level Consent
- Migration 113: vendor_consents JSONB on banner_consents + audit_log
- ConsentCreate schema + BannerConsentDB model extended
- banner_consent_service stores vendor_consents alongside categories
- Audit trail includes vendor-level decisions + user_agent

F6: Consent Rate Analytics
- Migration 114: user_agent on audit_log + time-series index
- BannerAnalyticsService: time series, category breakdown, device stats
- banner_analytics_routes: 4 endpoints (overview, time-series, categories, devices)
- AnalyticsDashboard.tsx: KPIs, bar chart, category bars, device breakdown
- New "Analytik" tab in cookie-banner page

[migration-approved]

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

admin-compliance/app/sdk/cookie-banner/page.tsx

@@ -9,8 +9,9 @@ import { CategoryCard } from './_components/CategoryCard'
 import { VendorTable } from './_components/VendorTable'
 import { EmbeddableVendorHTML } from './_components/EmbeddableVendorHTML'
 import { SiteSelector } from './_components/SiteSelector'
+import { AnalyticsDashboard } from './_components/AnalyticsDashboard'
 
-type BannerTab = 'config' | 'vendors' | 'embed'
+type BannerTab = 'config' | 'vendors' | 'embed' | 'analytics'
 
 export default function CookieBannerPage() {
   const { state } = useSDK()
@@ -75,6 +76,7 @@ export default function CookieBannerPage() {
           { id: 'config' as const, label: 'Konfiguration' },
           { id: 'vendors' as const, label: 'Verarbeiter' },
           { id: 'embed' as const, label: 'Einbettung' },
+          { id: 'analytics' as const, label: 'Analytik' },
         ]).map(tab => (
           <button key={tab.id} onClick={() => setActiveTab(tab.id)}
             className={`px-4 py-3 text-sm font-medium border-b-2 -mb-px transition-colors ${
@@ -91,6 +93,9 @@ export default function CookieBannerPage() {
       {/* Tab: Einbettung */}
       {activeTab === 'embed' && <EmbeddableVendorHTML siteId={activeSiteId || undefined} />}
 
+      {/* Tab: Analytik */}
+      {activeTab === 'analytics' && <AnalyticsDashboard siteId={activeSiteId || undefined} />}
+
       {/* Tab: Konfiguration */}
       {activeTab !== 'config' ? null : (<>
       {/* Stats */}