feat: V1 Control Enrichment — Eigenentwicklung-Label, regulatorisches Matching & Vergleichsansicht

863 v1-Controls (manuell geschrieben, ohne Rechtsgrundlage) werden als
"Eigenentwicklung" gekennzeichnet und automatisch mit regulatorischen
Controls (DSGVO, NIS2, OWASP etc.) per Embedding-Similarity abgeglichen.

Backend:
- Migration 080: v1_control_matches Tabelle (Cross-Reference)
- v1_enrichment.py: Batch-Matching via BGE-M3 + Qdrant (Threshold 0.75)
- 3 neue API-Endpoints: enrich-v1-matches, v1-matches, v1-enrichment-stats
- 6 Tests (dry-run, execution, matches, pagination, detection)

Frontend:
- Orange "Eigenentwicklung"-Badge statt grauem "v1" (wenn kein Source)
- "Regulatorische Abdeckung"-Sektion im ControlDetail mit Match-Karten
- Side-by-Side V1CompareView (Eigenentwicklung vs. regulatorisch gedeckt)
- Prev/Next Navigation durch alle Matches

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

admin-compliance/app/api/sdk/v1/canonical/route.ts

@@ -135,6 +135,19 @@ export async function GET(request: NextRequest) {
         backendPath = '/api/compliance/v1/canonical/blocked-sources'
         break
 
+      case 'v1-matches': {
+        const matchId = searchParams.get('id')
+        if (!matchId) {
+          return NextResponse.json({ error: 'Missing control id' }, { status: 400 })
+        }
+        backendPath = `/api/compliance/v1/canonical/controls/${encodeURIComponent(matchId)}/v1-matches`
+        break
+      }
+
+      case 'v1-enrichment-stats':
+        backendPath = '/api/compliance/v1/canonical/controls/v1-enrichment-stats'
+        break
+
       case 'controls-customer': {
         const custSeverity = searchParams.get('severity')
         const custDomain = searchParams.get('domain')
@@ -201,6 +214,11 @@ export async function POST(request: NextRequest) {
       backendPath = '/api/compliance/v1/canonical/generate/bulk-review'
     } else if (endpoint === 'blocked-sources-cleanup') {
       backendPath = '/api/compliance/v1/canonical/blocked-sources/cleanup'
+    } else if (endpoint === 'enrich-v1-matches') {
+      const dryRun = searchParams.get('dry_run') ?? 'true'
+      const batchSize = searchParams.get('batch_size') ?? '100'
+      const enrichOffset = searchParams.get('offset') ?? '0'
+      backendPath = `/api/compliance/v1/canonical/controls/enrich-v1-matches?dry_run=${dryRun}&batch_size=${batchSize}&offset=${enrichOffset}`
     } else if (endpoint === 'similarity-check') {
       const controlId = searchParams.get('id')
       if (!controlId) {