fix(snapshot): Cookie-Dedup + schneller Impressum-Tab + Tabellen-Zahl

- Cookies werden je Vendor nach Name dedupliziert (Consent-Phasen-Dubletten;
  BMW 2196 → ~772) — in cookie-check + get_snapshot, behebt aufgeblähte
  Kachel-/Finding-Zahlen.
- Impressum-Snapshot-Check überspringt den ~40s-LLM-Schritt (context skip_llm)
  → Tab lädt sofort statt leer zu bleiben.
- Vendor-Tabelle zeigt nur die Cookie-Zahl (kein 'Cookies'-Wort je Zeile).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend-compliance/compliance/tests/test_cookie_storage_inventory.py

@@ -4,11 +4,24 @@ from __future__ import annotations
 
 from compliance.services.cookie_storage_inventory import (
     build_storage_inventory,
+    dedupe_vendor_cookies,
     detect_storage_type,
     storage_transparency_finding,
 )
 
 
+def test_dedupe_vendor_cookies_removes_consent_phase_dupes():
+    vendors = [{"name": "V", "cookies": [
+        {"name": "_ga", "expiry": "2 Jahre"},
+        {"name": "_ga", "expiry": "2 Jahre"},   # before/after_accept-Dublette
+        {"name": "_GA", "expiry": "2 Jahre"},    # case-insensitiv
+        {"name": "sid", "expiry": "Session"},
+    ]}]
+    out = dedupe_vendor_cookies(vendors)
+    names = [c["name"] for c in out[0]["cookies"]]
+    assert names == ["_ga", "sid"]              # 4 → 2 eindeutig
+
+
 def test_framework_artifacts_not_cookies():
     assert detect_storage_type("ComponentDefStorage__MUTEX_X") == "framework_storage"
     assert detect_storage_type("GlobalValueProviders__MUTEX_Y") == "framework_storage"