refactor(consent-sdk): split ConsentManager + framework adapters under 500 LOC

Phase 4: extract config defaults, Google Consent Mode helper, and framework
adapter internals into sibling files so every source file is under the
hard cap. Public API surface preserved; all 135 tests green, tsup build +
tsc typecheck clean.

- core/ConsentManager 525 -> 467 LOC (extract config + google helpers)
- react/index 511 LOC -> 199 LOC barrel + components/hooks/context
- vue/index 511 LOC -> 32 LOC barrel + components/composables/context/plugin
- angular/index 509 LOC -> 45 LOC barrel + interface/service/module/templates

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

consent-sdk/src/core/consent-manager-google.ts

@@ -0,0 +1,38 @@
+/**
+ * Google Consent Mode v2 integration helper.
+ *
+ * Phase 4: extracted from ConsentManager.ts. Updates gtag() with the
+ * current consent category state whenever consent changes.
+ */
+
+import type { ConsentState } from '../types';
+
+/**
+ * Update Google Consent Mode v2 based on the current consent categories.
+ * No-op when running outside the browser or when gtag is not loaded.
+ * Returns true if the gtag update was actually applied.
+ */
+export function updateGoogleConsentMode(consent: ConsentState | null): boolean {
+  if (typeof window === 'undefined' || !consent) {
+    return false;
+  }
+
+  const gtag = (window as unknown as { gtag?: (...args: unknown[]) => void }).gtag;
+  if (typeof gtag !== 'function') {
+    return false;
+  }
+
+  const { categories } = consent;
+
+  gtag('consent', 'update', {
+    ad_storage: categories.marketing ? 'granted' : 'denied',
+    ad_user_data: categories.marketing ? 'granted' : 'denied',
+    ad_personalization: categories.marketing ? 'granted' : 'denied',
+    analytics_storage: categories.analytics ? 'granted' : 'denied',
+    functionality_storage: categories.functional ? 'granted' : 'denied',
+    personalization_storage: categories.functional ? 'granted' : 'denied',
+    security_storage: 'granted',
+  });
+
+  return true;
+}